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