Carbon Monoxide and Smoke Alarm Detection Method Electrochemical Ionization Up to 18 Units Interconnection Capability Power Source 120V AC 9V Audible Alert 85 dB @ 10 ft Visual Alert Style LED Diameter 5 5/8 in Height 2 in Width - Digital Readout No Battery Backup Yes Hush Button Yes Locking Pin Yes Operating Temp 40 Degrees to 100 Degrees F Standards UL2034 UL217 Manufacturers Warranty Length 10 yr Limited Battery Location Side
