The First Alert SC5 is engineered as a direct drop-in replacement for the discontinued Google Nest Protect, utilizing an included wiring adapter to fit existing ceiling mounts without requiring new electrical work. smarthomecompared found that its dual photoelectric and electrochemical sensors effectively distinguish between hazards like grease fires and carbon monoxide, while PureReviews noted that loud voice alerts specify both the danger type and device location for clear identification during emergencies. However, the unit lacks motion-activated pathway lighting and automated self-testing, forcing users to manually verify operation via a button press rather than relying on daily diagnostics. Because it works exclusively with the Google Home app and offers no Alexa or Apple HomeKit support, this alarm fits only households already invested in that ecosystem who prioritize easy installation over smart home versatility.
- — Designed as a drop-in replacement for discontinued Google Nest Protect, fitting existing ceiling mounts with included wiring adapter
- — Features loud built-in siren with voice alerts that specify the danger type and device location
- — Combines photoelectric smoke sensor and electrochemical CO sensor in one unit to reduce nuisance alarms
- — Lacks motion-activated pathway night light found on the Nest Protect it replaces
- — Works exclusively with Google Home app, offering no Alexa, Apple HomeKit, or Matter support
- — Missing self-testing automation feature, requiring manual button presses to verify operation
