4 Packs Smoke & Carbon Monoxide Detector Battery Operated,2-in-1 Smoke Detector Carbon Monoxide Detector Combo,Smoke Alarm with Digital Display for Home

Photoelectric sensor for smoke and a electrochemical co sensor for carbon monoxide means it is a 2-in-1 combination smoke and carbon monoxide alarm
Carbon monoxide detectors/smoke alarm has a digital display, offers you a real-time level of smoke and CO. This fire alarm has a standby mode, it means the digital display will be blank and it is still working.
Battery operated offers you a very easy installation, no need any wire, it is wireless. After inserting batteries, this fire and CO alarm beeps and turns on automatically in a short while. Then it starts to go into a standby mode. It features a low battery warning with a flashing red LED and a beeping sound that may be louder than 85 dB
Under the standby mode, power(green) LED will flash about each 60s. Smoke detector and carbon monoxide detector has other two LED lights, Alarm(Red)LED regularly works with beep all the way through a CO alarm, a fire alarm and a low battery mode. Fault(yellow)LED means malfunction
A test button is for testing and resetting. This carbon monoxide detector is suitable for installing on wall or ceiling with the included mounting bracket, screws and anchor plugs. It is suitable for living room, kitchen, bedroom, basement and so forth