[Equipped with advanced electrochemical sensors] With high sensitivity and fast response speed, carbon monoxide detectors can quickly and accurately detect carbon monoxide levels to the safety of you and your .[Easy to use] Carbon monoxide alarm is equipped with LCD digital display, so that you can easily read the carbon monoxide concentration. Test/Mute button allows you to test the CO alarm with one click. The CO detector alarm does not require wiring, so you can easily install it on a wall or anywhere in your home without an electrician [Battery power] The carbon monoxide detector is powered by 3 AAA batteries for easy battery replacement. With low power alarm function, it can continuously monitor carbon monoxide concentration even in the case of power failure, protecting you and your .[Sound and Light alarm] When a carbon monoxide detector detects dangerous levels of carbon monoxide, a red LED light flashes and an LCD display displays the current value of the gas concentration, sounding an alarm 85 decibels, which is enough to wake a sleeper.[Safe and ] carbon monoxide detector has been strictly tested. Please install an alarm on floor and in room to keep you and your safe. (Note: When testing alarms, do not blow holes directly .)Colour:WhiteMaterial:PlasticPackage Contents:1 x Carbon monoxide detectorsOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.