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Kidde Ring RGCUDR-RW vs First Alert SC5 SMCO600NV: Which Fits Your Home?

Choose by the compatible alarms already in your home and the battery routine you want, not by an unverified detection-performance claim. RGCUDR-RW is the Ring/Kidde-compatible option and uses two AA cells that Kidde says to change yearly under normal use; SC5 SMCO600NV appears on First Alert's listed First Alert/BRK and Nest Protect compatibility set and uses six CR123A cells, with replacement tied to its low-battery warning. Confirm your exact existing alarm models before setting up interconnection.

Published by Pickoryx · Published 2026-10-21

Source checked 2026-10-21 23:51 UTC

Products compared

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The buying question

Should you choose the Ring-connected Kidde RGCUDR-RW or First Alert SC5 SMCO600NV, given the other alarms and replacement batteries already in your home?

The Kidde uses Ring app notifications and compatible Kidde wire-free interconnect with two AA cells and a stated yearly replacement cadence; the SC5 uses Resideo Connect app notifications and a documented First Alert/BRK SC5 and Nest Protect compatibility list, with six CR123A cells replaced when the low-battery warning appears.

Quick verdict

Choose Kidde RGCUDR-RW Ring Smart Smoke + CO Alarm if

  • You want Ring app alerts and plan to connect only to compatible Kidde alarms listed for the RGCUDR-RW network.
  • A two-AA replacement format and Kidde's once-a-year normal-use schedule fit how you maintain alarms.
View Kidde RGCUDR-RW Ring Smart Smoke + CO Alarm on AmazonPaid link

Choose First Alert SC5 SMCO600NV Battery Smart Smoke + CO Alarm if

  • You need the SC5's documented compatibility with listed First Alert/BRK SC5 wireless alarms or Nest Protect, and can meet the Google Home app and account requirement for Nest Protect compatibility.
  • The specified six-CR123A replacement set and low-battery-warning routine fit your maintenance plan, even though the manual does not give a numeric battery interval.
View First Alert SC5 SMCO600NV Battery Smart Smoke + CO Alarm on AmazonPaid link
When to skip: You need a hardwired alarm rather than either of these battery-operated models.
When the recommendation changes
  • Check the exact model numbers of the alarms you plan to interconnect: the manufacturers document separate compatibility lists, and these pages do not establish cross-brand compatibility.
  • If you require a hardwired alarm, neither of these battery-powered models is the configuration to choose.

The differences that matter

Existing Alarm And Smart Home Ecosystem Fit

Kidde RGCUDR-RW Ring Smart Smoke + CO Alarm

The RGCUDR-RW uses Ring app notifications over Wi-Fi and a separate RF wire-free interconnect mode for compatible Kidde models. Its guide requires a 2.4 GHz Wi-Fi network for phone notifications and lists compatible interconnect models.[1, 2]

First Alert SC5 SMCO600NV Battery Smart Smoke + CO Alarm

The SC5 product page names the Resideo Connect app for phone alerts. First Alert lists SMCO600NV as compatible with specified First Alert/BRK alarms and Nest Protect; Nest Protect compatibility requires the Google Home app and a Google Account. The exact manual describes Smart Interconnect with First Alert/BRK SC5 wireless and Nest Protect alarms.[3, 4, 5]

What this changes: Choose against the exact interconnect list for alarms already installed in your home. These sources establish different named compatibility ecosystems, not universal cross-brand interconnection.[2, 4, 5]

The better fit depends on your priorities

Battery Format And Maintenance Workflow

Kidde RGCUDR-RW Ring Smart Smoke + CO Alarm

Kidde specifies two AA cells and says to replace them once a year under normal use. It names Energizer E91, Gold Peak 15A, or Golden Power GLR6A and says not to use lithium batteries.[1]

First Alert SC5 SMCO600NV Battery Smart Smoke + CO Alarm

First Alert specifies six replaceable Huiderui 3V CR123A cells. Its manual says actual service life depends on the alarm and environment, requires all cells to be replaced together, and says to replace them when the low-battery warning starts; it does not publish a numeric replacement interval.[3, 5]

What this changes: The AA option has a calendar-based schedule from Kidde; the SC5 uses a six-cell CR123A set and warning-based replacement guidance without a fixed interval. This supports a maintenance-planning choice, not a claim about lifetime cost or which alarm needs less upkeep.[1, 3, 5]

The better fit depends on your priorities

Best for your routine

Adding to a Ring/Kidde-compatible alarm network

Best fit: Kidde RGCUDR-RW Ring Smart Smoke + CO Alarm

Based on listed features, not comparative testing.

Kidde identifies Ring notifications and compatible Kidde wire-free interconnection for RGCUDR-RW. Verify each installed alarm model against Kidde's list.

View Kidde RGCUDR-RW Ring Smart Smoke + CO Alarm on AmazonPaid link

Keeping a listed First Alert/BRK SC5 or Nest Protect-compatible alarm network

Best fit: First Alert SC5 SMCO600NV Battery Smart Smoke + CO Alarm

Based on listed features, not comparative testing.

First Alert's compatibility list names SMCO600NV and Nest Protect models; the Google Home app and account are required when using Nest Protect compatibility.

View First Alert SC5 SMCO600NV Battery Smart Smoke + CO Alarm on AmazonPaid link

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

A price difference is relevant only after confirming the exact battery model, seller, condition, and included contents; this comparison does not establish that either ecosystem or battery routine is worth a particular premium.

There is not enough price history here to say whether either current offer is unusually low; compare current exact-model offers and their conditions before buying.

Limitations

  • Compatibility is limited to the exact models named in each manufacturer's documentation; these sources do not establish cross-brand interconnection. Confirm the models already installed before connecting alarms.
  • The current First Alert product page names Resideo Connect for phone alerts, while its exact manual still refers to the First Alert app in setup instructions. The page and manual agree that app-based alerts and interconnection are supported, but verify the current setup app when installing.
  • Kidde publishes a yearly battery replacement interval for normal use. The SC5 manual gives no numeric CR123A service interval and says service life depends on the alarm and environment; no battery-lifetime or total-cost comparison is made.
  • No controlled side-by-side detection, nuisance-alarm, or reliability testing was performed for this comparison.
  • The available price check is current-only and includes no historical window; verify seller and offer conditions for the exact item before purchase.

Questions shoppers ask

Will these two alarms interconnect with each other?

Do not assume so. The cited documents name compatible Kidde models for the RGCUDR-RW network and First Alert/BRK SC5 wireless and Nest Protect models for the SC5. They do not establish compatibility between the two brands; check the exact list for your existing alarms.

How often will I replace the batteries?

Kidde says to replace the RGCUDR-RW's two specified AA cells once a year under normal use. For the SC5, the manual requires six specified CR123A cells and says service life varies with the alarm and environment; replace the full set when the low-battery warning starts. It does not give a fixed interval.

Methodology and sources

The comparison is limited to the manufacturers' named alarm-interconnect ecosystems, app/setup requirements, specified battery cells, and published battery replacement guidance. It does not compare detection performance, battery lifespan, safety outcomes, or total ownership cost.

AI assistance was used to organize manufacturer documentation and compare the two models' published compatibility and battery instructions. Pickoryx did not conduct hands-on tests.

View 5 sources
  1. 1.Ring Smart Smoke + CO Alarm, 2 AA Battery Powered - RGCUDR-RWKidde · Official specifications · Source checked 2026-10-21 23:51 UTC
    Evidence used on this page
    • Exact RGCUDR-RW heading/model lines 28-33; Ring app alerts and compatible Kidde interconnection lines 35-45; yearly replacement under normal use lines 41-45 and 134-139; approved AA cells and lithium restriction lines 146-149.: Kidde identifies RGCUDR-RW as its Ring-connected AA-battery smoke/CO alarm, states the normal-use yearly replacement schedule, names three acceptable AA cell models, and limits wire-free interconnect alerts to compatible Kidde alarms.
  2. 2.Smart Smoke + Carbon Monoxide Alarm User GuideKidde · Official specifications · Source checked 2026-10-21 23:51 UTC
    Evidence used on this page
    • Cover lists RGCUDR-RW at PDF page 0; 2.4 GHz Wi-Fi and Ring app requirement at PDF page 1; model table separates Wi-Fi phone notifications from RF wire-free interconnect at PDF page 2; compatible interconnect model list and network setup in the Wire-Free Interconnect section.: The RGCUDR-RW guide distinguishes Wi-Fi phone notification from RF alarm-to-alarm interconnect and documents model-scoped interconnection; phone notifications require the Ring app and 2.4 GHz Wi-Fi.
  3. 3.Battery-Powered Smart Smoke & Carbon Monoxide Detector - SMCO600NVFirst Alert / Resideo · Official specifications · Source checked 2026-10-21 23:51 UTC
    Evidence used on this page
    • Exact SC5 battery product/SKU and current app name at lines 113-155; model SMCO600NV, battery-operated power, replaceable CR123A type and count of six at lines 215-224; current app onboarding at lines 253-257.: The current US product page identifies the battery-operated SC5 as model SMCO600NV and names the Resideo Connect app for phone alerts; the specification table lists six replaceable CR123A cells.
  4. 4.SC5 Compatible Smoke and Carbon Monoxide AlarmsFirst Alert / Resideo · Official support · Source checked 2026-10-21 23:51 UTC
    Evidence used on this page
    • The section headed SMCO600NV Compatible Alarms at lines 95-104 names the battery SMCO600NV separately from SMCO600NV-AC and lists Nest Protect battery and wired models; lines 104-105 requires Google Home app and Google Account for Nest Protect compatibility.: The compatibility table is explicitly headed for SMCO600NV and separates it from the -AC hardwired model; it names specific First Alert/BRK and Nest Protect alarm families and states the Google Home requirement for Nest compatibility.
  5. 5.SC5 Wireless Smart Smoke & Carbon Monoxide Alarm SMCO600NV Installation & Reference ManualFirst Alert / Resideo · Official specifications · Source checked 2026-10-21 23:51 UTC
    Evidence used on this page
    • Manual cover names SMCO600NV at PDF page 0; Smart Interconnect scope at PDF page 1; regular maintenance and battery-change instructions at PDF page 1, including weekly test, monthly soft-brush vacuuming, low-battery notification, six Huiderui CR123A replacement and simultaneous replacement; battery service life varies by alarm and environment without a numeric interval.: The exact SMCO600NV manual specifies six Huiderui 3V CR123A cells and replacement of the full set when its low-battery warning begins; it says service life depends on the alarm and installation environment and does not publish a numeric replacement interval. It identifies Smart Interconnect partners and still uses the older First Alert app name in setup instructions.