First Alert hardwired carbon monoxide detector with battery back-up

Features an electrochemical sensor which detects carbon monoxide gas and measures the concentration

Sounds a loud 85 decibel alarm when potentially harmful level is reached

2 silent features; unwanted alarms and low battery silence

Instant test/reset button

9-volt battery included

Battery life varies according to use and application

for professional installation only

UL (Underwriter's Laboratories) listed

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