Carbon Monoxide Alarm Detection Method Electrochemical No Interconnection Capability Power Source 9V Audible Alert 85 dB @ 10 ft Visual Alert Style LED Diameter 4 1/4 in Height 1 1/2 in Width - Digital Readout No Battery Backup Yes Hush Button Yes Locking Pin Yes Operating Temp 40 Degrees to 100 Degrees F Standards NFPA101 NFPA720 UL2034 Includes Mounting Hardware Manufacturers Warranty Length 10 yr Limited Battery Location Side