First Alert SC5 Smart Smoke & CO
A smart smoke and CO alarm with voice alerts, wireless interconnect, and phone alerts through the Resideo Connect app. The maker says it is compatible with and replaces Google Nest Protect.
Alarm spec sheet
| Type | Smoke and CO combo |
|---|---|
| Sensor | Photoelectric (smoke) and electrochemica |
| Power | Battery-operated, CR123A lithium (replaceable) for the batte |
| Interconnect | Wireless |
| Voice alerts | Yes |
| App | Yes |
| UL standards named | Conforms to UL 217 10th Edition Standard |
Listed features
- Voice alerts naming the type and location
- Phone alerts through the Resideo Connect app
Worth checking
- Battery and hardwire versions are separate products
Where to buy the SC5 Smart Smoke & CO
Prices and availability change. We may earn a commission from some links.
- Check for recalls: Search the agency's recall list with the model number and date code from the label: CPSC recall search.
- Use and supervision: follow the maker's warnings on the product, and see CPSC's Safe Nursery guide. Check the label and the maker's instructions, and ask your pediatrician about your child.
Full specs
| First Alert SC5 Smart Smoke & CO | |
|---|---|
| Type | Smoke or CO alarm |
| Alarm | combo |
| Sensor | Photoelectric (smoke) and electrochemica |
| Power | Battery-operated, CR123A lithium (replaceable) for the batte |
| Interconnect | wireless |
| Standards (maker) | Conforms to UL 217 10th Edition Standard |
Compare the SC5 Smart Smoke & CO with
How each closest rival differs from the SC5 Smart Smoke & CO, from the makers' specs.
- First AlertSMCO210 / SMCO210V ComboCompare side by side
- First AlertSMCO500V ComboCompare side by side
- First AlertSM210 / SM210V / SM210L 10-Year Smoke10-yearCompare side by side
- First AlertSMCO100 / SMCO200V Combo10-yearCompare side by side
SC5 Smart Smoke & CO: questions answered
From First Alert's published specs, last checked 2026-11-11.
Where should the First Alert SC5 Smart Smoke & CO go?
Maker's standards wording: Conforms to UL 217 10th Edition Standard. Use and supervision: follow the maker's warnings on the product, and see the AAP's safety and prevention pages. Check the label and the maker's instructions, and ask your pediatrician about your child.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More smoke and CO alarms
- First AlertSMICO100-AC Hardwired Combo
- First AlertSMI100-AC Hardwired Smoke
- First Alert10-Year Battery Photoelectric Smoke Alarm, Slim Profile
- First AlertCO400 Battery Carbon Monoxide Alarm
- First AlertCO605 Plug-in Carbon Monoxide Alarm
- First AlertCO710 Carbon Monoxide Alarm with Digital Temperature Display
Where these specs come from
- firstalert.com/products/sc5-battery-smart-smoke-carbon-monoxide-alarm
- firstalert.com/products/sc5-hardwire-smart-smoke-carbon-monoxide-alarm
Last checked 2026-11-11. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.