Putogesafe Carbon Monoxide Detector, 10 Year Sensor Life, EN50291 Certified, with Battery Warning Indicator and Test Button, 85 dB, for Ceiling and Wall Mounting, White (1 Pack)

Sound and light warning: a CO detector certified and tested according to EN 50291, which quickly detects the toxic carbon monoxide gas and does not cause false alarms. If the concentration of CO is too high, the sensor emits an optical and acoustic signal: loud alarm of 85 dB is accompanied by a red flashing light.
Safe for 10 years: the CO detector is equipped with an electro-chemical sensor with a service life of 10 years. You can always check the functionality of the device with a test button. The sensor then signals itself the end of its 10 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