Product DescriptionThe CM-E1 combines innovation with a smooth and easy installation system to provide carbon monoxide detection in residential and commercial office environment. Flush or surface mount options, alarm and trouble relays, and 85 dB buzzer.The CM-E1 is a wired Carbon Monoxide Gas Detector, requiring 9-32 VDC of power, with 2 relays and a buzzer. The CM-E1 is UL Listed.