3 Pack Combination Smoke Carbon Monoxide Alarm Detector Battery Operated, Portable Smoke and Co Alarm for Home Bedroom Travel，Easy to Install

Combination Smoke Carbon Monoxide Alarm Detector Battery-operated Unit installs Quickly and Easily Without an Electrician, loud 85dB Decibel alarm
It Can Indicate the Real-time Carbon Monoxide (co) Concentration In the Surrounding Air. When There Is A Co Concentration Of 30-999ppm In The Air, the Screen Will Change To Blue Backlight And Display the Real-time Concentration.
Smoke and Co Detector You Can Hear the low Power alarm When the Power is Going to Run out, and Won’t Miss the Chance to Change the New Battery.