Among these smart smoke detectors, I rank the Kidde Smart Smoke and Carbon Monoxide Detector with Ring as the best overall for households that want smoke and carbon monoxide alerts in one device. The HEIMAN S1-TM stands out for Matter over Thread support and added temperature and humidity sensing, while the Heiman S1-R kit suits buyers who want several wireless-interconnected detectors and a gateway. The main tradeoffs are smart-home compatibility, power source, and whole-home coverage: a connected alert is not the same as interconnected alarms, and hardwired models call for a different installation plan than battery-powered ones. I compare all six options by their distinct strengths and limitations below. Read on for the full breakdown and guidance on choosing the right setup.
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Key Takeaways
- Kidde’s Ring-connected combination detector adds carbon monoxide detection alongside smoke alerts, making it a broader single-device choice than the smoke-only options.
- The HEIMAN S1-TM adds temperature and humidity sensors to Matter over Thread connectivity; those extra readings may appeal to smart-home users, but they do not replace dedicated smoke coverage.
- The HEIMAN Matter over Thread detector and S1-TM share a connectivity approach, so buyers should decide whether the S1-TM’s added environmental sensors justify choosing it over the simpler model.
- Kidde’s hardwired Ring model includes AA battery backup, while the battery-powered Kidde models avoid dependence on household wiring; installation and backup expectations distinguish these choices.
- The Heiman S1-R is the only listed multi-detector kit, with six detectors and a gateway, making it the clearest fit for buyers prioritizing coordinated coverage across several rooms.
| Kidde Smart Smoke and Carbon Monoxide Detector with Ring, Battery-Powered, RGCUDR-RW |  | Best Battery-Powered Smoke and CO Pick | Detection: Smoke and carbon monoxide | Power: 2 included AA alkaline batteries | Connectivity: Ring app notifications and wire-free interconnection with compatible Kidde alarms | VIEW LATEST PRICE | See Our Full Breakdown |
| HEIMAN S1-TM Matter over Thread Smoke Detector with Temperature and Humidity Sensors |  | Best for Smart-Home Automations | Model: HEIMAN S1-TM | Sensor: Dual-beam photoelectric | Connectivity: Matter over Thread | VIEW LATEST PRICE | See Our Full Breakdown |
| HEIMAN Matter over Thread Smart Smoke Detector |  | Best Simple Matter Smoke Detector | Model: HEIMAN S1-M | Sensor: Dual-beam photoelectric | Connectivity: Matter over Thread | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke and Carbon Monoxide Detector with Ring, Hardwired with AA Battery Backup |  | Best Hardwired Smoke and CO Pick | Detection: Smoke and carbon monoxide | Power: Hardwired with AA battery backup | Connectivity: Ring app and Alexa | VIEW LATEST PRICE | See Our Full Breakdown |
| Heiman S1-R Smart Wireless Interconnected Smoke Detector Kit, 6 Detectors and Gateway |  | Best Multi-Room Interconnected Kit | Included: 6 smoke detectors and 1 gateway | Sensor: Dual-beam photoelectric | Battery: 10-year CR123A lithium battery per detector | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke Detector with Ring, AA Battery Powered |  | Best for Ring Households | Model: RGSDR-RW | Power source: 2 AA alkaline batteries, included | Connectivity: Ring app, wireless interconnectivity, and Alexa-enabled devices | VIEW LATEST PRICE | See Our Full Breakdown |
| smart smoke detector | Connectivity | Power | Model | Sensor |
|---|---|---|---|---|
| Kidde Smart Smoke and Carbon M | Ring app notifications and wire-free interconnection with compatible Kidde alarms | 2 included AA alkaline batteries | — | — |
| HEIMAN S1-TM Matter over Threa | Matter over Thread | — | HEIMAN S1-TM | Dual-beam photoelectric |
| HEIMAN Matter over Thread Smar | Matter over Thread | Included CR123A battery | HEIMAN S1-M | Dual-beam photoelectric |
| Kidde Smart Smoke and Carbon M | Ring app and Alexa | Hardwired with AA battery backup | — | — |
| Heiman S1-R Smart Wireless Int | — | — | — | Dual-beam photoelectric |
| Kidde Smart Smoke Detector wit | Ring app, wireless interconnectivity, and Alexa-enabled devices | — | RGSDR-RW | — |
More Details on Our Top Picks
Kidde Smart Smoke and Carbon Monoxide Detector with Ring, Battery-Powered, RGCUDR-RW
I’d choose this Kidde when smoke and carbon monoxide coverage and Ring alerts matter more than smart-home platform flexibility. It runs on two included AA batteries, so it can go where hardwiring is impractical, and it sends app notifications for alarms, low battery, and low-level CO. Compared with the hardwired Kidde Smart Smoke and CO Detector, installation is simpler, but you give up a wired power source and battery replacement remains part of upkeep. Wire-free interconnection with compatible Kidde alarms can spread an alert through the home; Alexa devices can also provide notifications. The main caveat is that optional 24/7 monitoring requires a separate Ring subscription. I’d skip it if you want a detector that joins Matter-based systems or prefer not to manage batteries.
Pros:- Detects both smoke and carbon monoxide
- Sends Ring app alerts for smoke, CO, and low battery
- Battery power avoids the need for electrical wiring
- Wire-free interconnection can alert you when a compatible Kidde alarm sounds
Cons:- Optional 24/7 monitoring requires a separate Ring subscription
- Two AA batteries need eventual replacement
Best for: Ring households that need a battery-powered alarm for both smoke and carbon monoxide in a spot without existing wiring
Not ideal for: Buyers seeking Matter smart-home integration, wired power, or optional professional monitoring without a separate Ring subscription
- Detection:Smoke and carbon monoxide
- Power:2 included AA alkaline batteries
- Connectivity:Ring app notifications and wire-free interconnection with compatible Kidde alarms
- Alexa:Notifications from Alexa-enabled devices
- Monitoring:Optional 24/7 monitoring through a separate Ring subscription
- Standards:UL 217 and FCC
Our verdict“Choose this Kidde for Ring app alerts and smoke-plus-CO protection in a battery-powered format, but skip it if you want Matter support or wired power.”
HEIMAN S1-TM Matter over Thread Smoke Detector with Temperature and Humidity Sensors
The HEIMAN S1-TM is the clearest fit here for buyers building around Matter over Thread who also want temperature and humidity readings. Its dual-beam photoelectric sensor is designed to detect fine smoke from smoldering fires, while the extra climate sensors can feed broader home automations. Unlike the HEIMAN S1-M Matter over Thread Smart Smoke Detector, this model adds those readings and offers magnetic or screw mounting, giving it more flexibility for placement and routines. That extra smart-home reach comes with a setup requirement: remote integrations need a compatible Matter hub with a Thread border router. Home Assistant users also need a network that allows IPv6, router advertisements, and mDNS. The 85 dB alarm and one-touch test and silence controls keep basic operation simple, but this is a poor fit for homes without Thread infrastructure.
Pros:- Matter over Thread supports local smart-home integration without Wi-Fi
- Dual-beam photoelectric sensing is designed to detect fine smoke and smoldering fires
- Temperature and humidity sensors add useful climate data for automations
- Offers magnetic or screw mounting and one-touch test and silence controls
Cons:- Smart-home connectivity requires a compatible Matter hub with a Thread border router
- Home Assistant setup depends on specific IPv6 and local-network support
Best for: Smart-home owners with a Matter hub and Thread border router who want smoke detection plus indoor temperature and humidity data
Not ideal for: Buyers without a compatible Thread border router or Home Assistant users whose network blocks IPv6, router advertisements, or mDNS
- Model:HEIMAN S1-TM
- Sensor:Dual-beam photoelectric
- Connectivity:Matter over Thread
- Compatible platforms:Apple Home, Google Home, Alexa, SmartThings, Homey, and Home Assistant
- Detected conditions:Smoke, temperature, and humidity
- Alarm volume:85 dB
- Power and alarm life:Battery powered; 10-year alarm life
- Mounting and controls:Magnetic or screw mounting; LED indicators; one-touch test and silence
- Listings:UL 217 10th Edition, FCC, and CSFM
Our verdict“Pick the S1-TM if you already have Thread infrastructure and want climate sensors alongside smoke alerts; choose the simpler S1-M if you do not need those extra readings.”
HEIMAN Matter over Thread Smart Smoke Detector
The HEIMAN S1-M keeps the smart feature set focused: photoelectric smoke detection, local Matter over Thread automations, and straightforward test and silence controls. It is a better match than the S1-TM for buyers who do not need temperature or humidity monitoring and want a smoke-only device. Like that more sensor-rich model, it requires a compatible Matter hub with a Thread border router; it does not connect to smart-home platforms on its own. A supplied CR123A battery, 85 dB alarm, and LED indicators cover the basic hardware needs, while the stated 10-year alarm life limits routine upkeep. Compared with the six-detector HEIMAN S1-R kit, this is a single-detector route without a Wi-Fi gateway. Home Assistant users should check their network’s IPv6 and mDNS support before choosing it.
Pros:- Matter over Thread enables local smart-home automations without Wi-Fi
- Dual-beam photoelectric sensing targets fine smoke and smoldering fires
- Includes a CR123A battery, LED indicators, and one-touch test and silence
- 85 dB alarm and stated 10-year alarm life
Cons:- Smart-home integration requires a compatible Matter hub with a Thread border router
- Home Assistant setup depends on IPv6 and unblocked local network discovery
- Screw mounting offers less placement flexibility than the S1-TM’s magnetic option
Best for: Matter smart-home owners who need a single smoke detector with local Thread automations and no extra climate sensors
Not ideal for: Buyers without a Matter hub and Thread border router, or households seeking a multi-room detector kit and gateway alerts
- Model:HEIMAN S1-M
- Sensor:Dual-beam photoelectric
- Connectivity:Matter over Thread
- Hub requirement:Compatible Matter hub with Thread border router
- Compatible platforms:Apple Home, Google Home, Alexa, SmartThings, and Home Assistant
- Power:Included CR123A battery
- Alarm:85 dB
- Mounting and controls:Screw mounting; LED indicators; one-touch test and silence
- Certification and alarm life:UL 217 10th Edition, FCC, and CSFM listed; 10-year alarm life
Our verdict“Choose the S1-M for a single Matter-connected smoke alarm with a focused feature set, but pick the S1-TM if climate sensing or magnetic mounting matters.”
Kidde Smart Smoke and Carbon Monoxide Detector with Ring, Hardwired with AA Battery Backup
For a home with existing alarm wiring, this Kidde pairs hardwired power with smoke and carbon monoxide detection, Ring app alerts, and AA battery backup. That makes it a more natural replacement for a wired alarm than the battery-powered Kidde Smart Smoke and CO Detector with Ring, which avoids installation wiring but depends on AA batteries as its main power source. This model can also provide mobile alerts for other hardwired alarms when added to the home system, giving it an advantage over a single standalone detector. Enhanced sensing is designed to reduce cooking-related nuisance alarms, though it does not remove the need to place and maintain alarms properly. Optional 24/7 monitoring requires a subscription, and whole-home mobile alerts depend on the wired setup. I’d pass if your home lacks compatible wiring or you want Matter integration.
Pros:- Detects both smoke and carbon monoxide
- Hardwired power is backed up by AA batteries
- Ring app provides smoke, CO, and low-battery alerts
- Can send mobile alerts for other hardwired alarms when added to the system
Cons:- Installation depends on compatible hardwired alarm wiring
- Optional 24/7 monitoring requires a separate subscription
- Whole-home mobile alerts depend on adding a smart detector to the hardwired system
Best for: Homeowners replacing a hardwired alarm who want Ring notifications, smoke and CO detection, and battery backup
Not ideal for: Renters or buyers without suitable alarm wiring, and smart-home users seeking Matter integration
- Detection:Smoke and carbon monoxide
- Power:Hardwired with AA battery backup
- Connectivity:Ring app and Alexa
- Alerts:Smoke, carbon monoxide, and low battery
- Whole-home connectivity:Can provide mobile alerts for other hardwired alarms when one smart detector is added
- Nuisance alarm design:Enhanced sensing is designed to reduce cooking-related nuisance alarms
- Standards:UL 217 and FCC requirements
Our verdict“Choose this Kidde for a wired home that needs Ring alerts and smoke-plus-CO coverage, but choose its battery-powered counterpart if wiring is unavailable.”
Heiman S1-R Smart Wireless Interconnected Smoke Detector Kit, 6 Detectors and Gateway
The HEIMAN S1-R kit is the strongest choice here for covering multiple rooms with linked alarms: six detectors sound together locally when one detects smoke, even if Wi-Fi is down. Its gateway adds app and email alerts over 2.4 GHz Wi-Fi, while each unit uses a dual-beam photoelectric sensor and a 10-year CR123A battery. Compared with a single-device Matter model such as the HEIMAN S1-M, this kit offers a more complete multi-room setup without requiring a Thread border router, but it does depend on a gateway for remote alerts. The detectors also support up to 24 linked units, useful for expanding coverage. Check your network before buying: 5 GHz Wi-Fi is not supported, and smart-home integrations may need a compatible hub or added setup. Magnetic pads or mounting hardware provide two installation routes.
Pros:- Six detectors interconnect locally, so linked alarms sound without Wi-Fi
- Gateway supports smartphone and email alerts over 2.4 GHz Wi-Fi
- Each detector has a 10-year CR123A battery and 85 dB alarm
- System can interconnect up to 24 detectors and offers magnetic or hardware mounting
Cons:- Remote alerts require the gateway and a 2.4 GHz Wi-Fi network
- Smart-home integrations may require a compatible hub or additional setup
- A six-detector kit is less suitable for buyers seeking one replacement alarm
Best for: Households outfitting several rooms at once that want linked local alarms, a gateway for remote alerts, and long-life batteries
Not ideal for: Buyers with only 5 GHz Wi-Fi, those needing a single detector, or shoppers who want smart-home integration without extra setup
- Included:6 smoke detectors and 1 gateway
- Sensor:Dual-beam photoelectric
- Battery:10-year CR123A lithium battery per detector
- Alarm volume:85 dB
- Interconnection:Local wireless interconnection for up to 24 detectors
- Wi-Fi:2.4 GHz; not compatible with 5 GHz
- Smart-home compatibility:Home Assistant, IFTTT, Google Home, and SmartThings; compatible hub or setup may be required
- Mounting and size:Magnetic pads or mounting hardware; 70 mm diameter × 37 mm height
- Listings and warranty:UL 217 10th Edition, CSFM, and FCC; 10-year limited warranty
Our verdict“Choose the S1-R for linked smoke coverage across several rooms with gateway alerts, but skip it if your network lacks 2.4 GHz Wi-Fi or you only need one detector.”
Kidde Smart Smoke Detector with Ring, AA Battery Powered
I’d choose this model when Ring app alerts and straightforward battery installation matter more than carbon monoxide detection. It reports smoke and low-battery events without a subscription, and compatible Kidde alarms can sound together wirelessly across the home. Compared with the Kidde Smart Smoke and Carbon Monoxide Detector with Ring, Battery-Powered, this detector focuses on smoke only, so it may suit buyers who already handle CO detection separately—but it leaves out that extra layer of protection. Two included AA alkaline batteries avoid wiring work, though they add a recurring replacement task. Optional 24/7 monitoring requires a subscription, so the no-subscription alerts are app notifications, not round-the-clock professional monitoring. Its sensing is designed to reduce cooking-related nuisance alarms, a useful distinction for kitchens near living areas.
Pros:- Sends smoke and low-battery alerts through the Ring app without a subscription for basic alerts
- Links wirelessly with compatible Kidde alarms so alerts can reach other areas of the home
- Battery-powered installation avoids the need for household wiring
- Sensing is designed to reduce cooking-related nuisance alarms
Cons:- Detects smoke only; it does not add carbon monoxide detection like the Ring-connected Kidde combo model
- 24/7 smoke monitoring requires a separate subscription
- Requires two AA alkaline batteries, which need periodic replacement
Best for: Ring users who want app alerts and wireless linking between compatible Kidde smoke alarms without installing hardwired equipment
Not ideal for: Buyers who want carbon monoxide detection in the same unit, professional monitoring without a subscription, or a hardwired detector with battery backup
- Model:RGSDR-RW
- Power source:2 AA alkaline batteries, included
- Connectivity:Ring app, wireless interconnectivity, and Alexa-enabled devices
- Basic alerts:Smoke and low-battery notifications without a subscription
- Monitoring:Optional 24/7 smoke monitoring requires a $5/month subscription
- Certifications:UL 217 and FCC standards
- Detection speed claim:Over 25% faster than a leading competitor, based on internal testing
Our verdict“Choose this smoke-only Kidde if you want Ring app alerts and wireless alarm linking without wiring, but skip it if you need built-in CO detection or subscription-free professional monitoring.”
How We Picked
I compared these six models on the factors that change a smoke-detector purchase: what hazards they detect, how they connect, how they get power, and whether they support coverage beyond one room. I also looked at practical usability questions, including whether a buyer may need a compatible smart-home platform, a gateway, existing wiring, or multiple units. Extra environmental sensors count as a differentiator, but not as a substitute for smoke or carbon monoxide protection.
The ranking favors options with a clear fit for common household needs and a useful balance of detection, connectivity, and setup demands. Kidde’s Ring combination detector takes the lead for its smoke-and-CO scope; the HEIMAN S1-TM follows for buyers invested in Matter over Thread who value its additional sensors. The hardwired Kidde, standalone HEIMAN Matter detector, S1-R multi-unit kit, and battery-powered Kidde smoke detector each serve more specific priorities, so their order reflects versatility for a broad audience rather than a claim that one installation style suits every home.
| smart smoke detector | Connectivity | Model |
|---|---|---|
| Kidde Smart Smoke and Carbon M | Ring app notifications and wire-free interconnection with compatible Kidde alarms | — |
| HEIMAN S1-TM Matter over Threa | Matter over Thread | HEIMAN S1-TM |
| HEIMAN Matter over Thread Smar | Matter over Thread | HEIMAN S1-M |
| Kidde Smart Smoke and Carbon M | Ring app and Alexa | — |
| Heiman S1-R Smart Wireless Int | — | — |
| Kidde Smart Smoke Detector wit | Ring app, wireless interconnectivity, and Alexa-enabled devices | RGSDR-RW |
Factors to Consider When Choosing Smart Smoke Detectors
Before choosing a model, I would start with the home’s existing alarms, wiring, and smart-home setup rather than the app features alone. These decisions affect installation, backup protection, and whether an alert reaches the rooms or people that need it.
Match Detection to the Hazards You Want Covered
Smoke detection and carbon monoxide detection solve different safety needs, so check the exact detection scope before comparing connected features. A combination model such as the Kidde Ring options can cover both hazards in one device, while the HEIMAN models listed here focus on smoke detection. A common mistake is treating temperature or humidity readings as a substitute for either alarm function; they provide different information. If you already have separate CO alarms, a smoke-only model may fit into that setup, but map out coverage room by room first. Think about where each alarm will go and whether one device can serve that location without leaving another area uncovered.
Choose Power Around Your Home, Not Just Convenience
Battery-powered detectors can be easier to place where there is no compatible alarm wiring, while a hardwired model may suit a home with an existing wired alarm system. The Kidde hardwired option also lists AA battery backup, which addresses a different concern from its normal power connection. Check the model’s installation instructions and local requirements before assuming a hardwired unit can replace an existing alarm directly. Battery models still require attention to battery condition and maintenance; wireless connectivity does not remove those duties. If you rent or plan to move, a battery-powered unit may be simpler to install and relocate, subject to applicable rules and the product’s mounting requirements.
Separate Phone Alerts From Interconnected Alarms
A phone notification and an alarm sounding across multiple rooms are not the same capability. Before buying, confirm whether the product supports alarm-to-alarm interconnection, app notifications, or both, and check what hardware or network each function needs. The Heiman S1-R listing presents a six-detector kit with a gateway, while the other options have different connection approaches; do not assume they coordinate with one another. A single smart detector can send useful alerts, yet it may not provide the same household coverage as a system of linked alarms. Consider who needs to hear an alert at home and who needs to receive it remotely.
Check Smart-Home Compatibility Before Committing
Connectivity labels are only useful when they match the platforms and devices already in your home. The two HEIMAN Matter over Thread options are relevant to buyers building around that standard, while the Kidde models in this lineup are associated with Ring. Confirm the required hub, gateway, app, and network conditions in the product documentation before purchase. A frequent buying mistake is choosing a detector for a protocol name without checking whether the household has the equipment needed to use it. If you mainly want an audible local alarm, a feature-rich smart-home setup may add complexity without solving a real need.
Decide Whether Extra Sensors Earn Their Place
The HEIMAN S1-TM adds temperature and humidity sensing to its smoke-detection and connectivity features. Those readings may be useful in a home where environmental monitoring is part of an existing smart-home routine, but they do not make the detector a better fit for every buyer. Extra sensors can increase the appeal of one device while leaving the central question—smoke coverage—unchanged. Compare the S1-TM with the HEIMAN Matter detector by asking whether you will use those additional readings, not simply whether more sensors sound better. If you will not act on that data, a simpler detector may be the more sensible match.
Plan Coverage Across Rooms and Floors
Buying a single smart detector does not automatically create whole-home protection. Start by listing existing alarms and identifying gaps, then check local fire-safety guidance and each product’s placement instructions. The S1-R’s six-detector kit is the clearest multi-unit option in this group, but its gateway and system requirements should fit your setup before you choose it. A bundle can simplify buying several matching units, yet it may be unnecessary if you only need to replace one detector. Prioritize correct placement and compatible alarms over adding connected features to a single location.
Frequently Asked Questions
Should I choose a smoke-only detector or a smoke-and-carbon-monoxide model?
Choose based on the protection already installed in your home, not on the number of features in the product name. A combination Kidde model can cover smoke and carbon monoxide in one device, while the HEIMAN options in this roundup are smoke detectors. If your home already has suitable CO alarms in the right locations, a smoke-only option may complement them. If coverage is incomplete, compare the placement instructions and detection scope for each device before deciding. Smart notifications do not make up for a missing type of alarm.
Does a phone alert mean every alarm in my home will sound?
No. A notification sent to a phone is separate from alarm-to-alarm interconnection, which can cause other detectors to sound when one detects smoke. Check the product documentation for each function and any required gateway, hub, or compatible units. The S1-R kit is the listed multi-detector package here, but buyers should still verify how its detectors coordinate and what the gateway does. If you need the household to hear an alarm across several floors, choose a system based on confirmed interconnection behavior rather than app connectivity alone.
Can I replace a hardwired alarm with a battery-powered smart detector?
Do not assume a battery-powered detector is a direct replacement for a hardwired alarm. Existing wiring, local requirements, mounting, and the instructions for both the old and new units affect whether a swap is appropriate. The Kidde hardwired Ring model is the most directly relevant option in this lineup for homes with compatible wiring, and it lists AA battery backup. If you are unsure what your current alarm requires, check its documentation or consult a qualified installer before changing the setup. Preserve required coverage while deciding which smart features you want.
What should I check before choosing a Matter over Thread detector?
Check that your smart-home setup supports the required Matter and Thread functions and that any needed border router, hub, app, or network is available. The HEIMAN S1-TM and HEIMAN Matter detector both use Matter over Thread, but their listed features differ because the S1-TM adds temperature and humidity sensing. Confirm what alerts and integrations the current product documentation supports rather than relying on the protocol name alone. If you do not plan to use a connected home platform, those requirements may add setup work without much benefit. Keep local alarm performance and placement at the center of the choice.
Is a multi-detector kit a better choice than buying one smart alarm?
A kit makes more sense when you need several detectors and want to evaluate them as a coordinated system. The Heiman S1-R includes six detectors and a gateway, which distinguishes it from the single-device options listed here. A single unit may be the better fit for replacing one alarm or filling one coverage gap, especially if other detectors are already installed. Before choosing a kit, confirm its interconnection behavior, gateway requirements, and compatibility with your home’s existing alarms. More units only help when they cover the right locations and work as intended together.
Conclusion
For most buyers seeking one connected device with broader hazard coverage, I would start with the Kidde Smart Smoke and Carbon Monoxide Detector with Ring as the best overall pick. The HEIMAN Matter over Thread detector is my best value-style choice for buyers who want that connectivity approach without the S1-TM’s extra environmental sensors; the S1-TM is the best premium fit for smart-home users who will use temperature and humidity readings. For beginners, I would favor the battery-powered Kidde option when Ring compatibility fits their setup and a simple installation matters; check its smoke-only scope against your existing CO coverage. Choose the hardwired Kidde for a compatible wired installation, or the Heiman S1-R kit when several detectors and a gateway better match your coverage plan. My final advice is to confirm detection type, installation needs, and household coverage before choosing based on connectivity alone.
