Carbon Monoxide Alarm, Detection Method Electrochemical, No Interconnection Capability, Power Source (3) AA Batteries, Audible Alert 85 dB @ 10 ft, Visual Alert Style LED, Height 5 in, Depth 1 1/2 in, Width 3 in, Digital Readout Yes, Battery Backup No, Features Features End Of Life Alarm, Hush Button No, Operating Temp. 40 Degrees to 100 Degrees F, Standards UL2034, Includes Batteries, Manufacturers Warranty Length 7 yr Limited, Battery Location Back