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 2 3/4 in, Depth 1 1/2 in, Width 4 3/4 in, Digital Readout No, Battery Backup Yes, Features Red Pulses During Alarm and Green Once Every 30 Seconds, Increased Sensor Life 7 Years, Hush Button No, Locking Pin No, Operating Temp. 40 Degrees to 100 Degrees F, Standards UL2034, Manufacturers Warranty Length 7 yr Limited