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 this is a 2-in-1 combination smoke and carbon monoxide alarm
• Carbon monoxide detectors/smoke alarm has a digital display, provide you with 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 provide you with an 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 time. Then it starts to enter a standby mode. It features a low battery warning with a flashing red LED and a beeping sound that is louder than 85 dB
• Under the standby mode, power(green) LED will flash about every 60s. Smoke detector and carbon monoxide detector has other two LED lights, Alarm(Red)LED usually works with beep during 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 on