2-in-1 Smoke Detector Carbon Monoxide Detector Combo,Smoke and Carbon Monoxide Alarm with Test Button and Digital Display

Dual Sensors: This combination smoke carbon monoxide alarm detects both smoke and carbon monoxide. It's working method: a high sensitivity photoelectric sensor to detect smoke and high stability electrochemical co sensor to detect carbon monoxide. They are separate, no matter which sensor is triggered because of dangerous concentration, this smoke and carbon monoxide detector will beep and blink with red led

Loud Beep: This smoke alarm has a louder than 85 decibels beep with red LED flashing. It is loud enough to let you know the danger and take ation to avoid it quickly. It is recommended to install more than one in your house for a maximum protection

Red or Green Led function: Once smoke or carbon monoxide reaches their dangerous concentration, this smoke and carbon monoxide detector will go off and blink with red led. Red led and beep also let you know if batteries need to be replaced or not(capacity of battery is less than 3.6V). Green led with beep will work for test button to show fire alarm's different working status

Readable Digital Display: when smoke or CO concentration reaches their dangerous level, the screen of fire alarm smoke detector will show the CO or smoke concentration and illuminate.

STANDBY MODE: screen light will not be on under standby mode, so this will not disturb your sleeping. When this fire alarm smoke detector enters standby mode, its green led will blink about every 60s

Green Led Too Bright? : If you feel that the green led is too bright, it is recommended to cover with a transparent pvc until you feel good. This carbon monoxide detectors smoke alarm is easy to install. Both wall and ceiling are suitable for installation