Jemay Combination Smoke and Carbon Monoxide Detector, Battery Operated Smoke Detector Carbon Monoxide Detector Combo with 10-Year Lifespan，Large LCD Display, Test/Silence Button, 1 Pack

[2-in-1 Protection] The smoke and carbon monoxide detector features electrochemical Carbon Monoxide sensing technology and photoelectric smoke sensor optimized to simultaneously detect the CO concentration and the larger smoke particles produced by smoldering fires.
[Informative LCD] Large display screen, clearly indicates smoke warning and real-time CO concentration in the surrounding air, as well as the remaining battery life and working status. To save power, it will activate only when the device is tested or the ppm has reached the alarm level for a certain period.
[7-Year Replaceable Battery] The 10-Year lifespan fire and CO alarm is Powered by 3 AA batteries for easy installation, without requiring an electrician. The sustainable power of battery supplies for 7 years and features 3 reminder modes to let you know when they need replacing：chirp sound, indicator light, and LCD display.