Combo Smoke and Co Detector: Features electrochemical Carbon Monoxide sensing technology and photoelectric smoke sensor optimized to detect larger smoke particles produced by smoldering fires; helps minimize the number of false alarms

10 Year Battery Operated: This combination smoke detector and carbon monoxide detector alarm provides 10 years of continuous power with a built-in lithium battery; provides continuous monitoring of smoke and co levels, even if there's a power failure; an end-of-life signal will let you know when it's time to replace the unit for safety

Test/Sience ButtoTest/Sience Button: Tests the unit for proper operation and resets the carbon monoxide alarm, Alarmn: Tests the unit for proper operation and resets the carbon monoxide alarm, Alarm

LOW BATTERY SIGNAL: Low battery voltage signal and end of life warning ensures the co detector can work normal. Environment friendly, without smell, radiation or harm. It can keep you and your family safe at any time

A loud 85-decibel alarm sounds when Carbon Monoxide, and Smoke levels begin to rise, Easy to Install and Use: The alarm can easily install with mounting bracket. No hardwired anymore