Carbon Monoxide Detector, 7 Year Sensor Life CO Detector with Battery Warning Indicator and Test Button, 85 dB, for Ceiling and Wall Mounting, White (4 Pack)

Sound and
Light Warning: When CO levels rise, this co detector will quickly detects the toxic carbon monoxide gas, Also the sensor emits an optical and acoustic signal: loud alarm of 85 dB is accompanied by a red flashing light.
Safe for 7 years: the CO detector is equipped with an electro-chemical sensor with a service life of 7 years. You can always check the functionality of the device with a test button. The sensor then signals itself the end of its 7 year life cycle
Batteries included: 2 x AA batteries are included. They should last about 3 years. After you are alerted by the yellow light on the gas detector and warning sound of empty batteries, simply change the batteries for any AA alkaline batteries
24 HOURS PROTECT: If you have problem in smoke alarms interconnection, please contact us. Smoke detectors should be installed in every room (except bathrooms and kitchens). Don't test smoke detector with cigarette or burning paper, sensor will be damaged