BRK Brands SC9120LBL Hardwire AC Smoke and Carbon Monoxide Combination Alarm with 10 Year Sealed Battery Backup Smoke Alarm  (Ceiling Mounted)

Technical Specification: Item Smoke and Carbon Monoxide Alarm Detection Method Ionization, Electrochemical Interconnection Capability Yes Power Source 120VAC 60Hz, 9V Lithium Audible Alert 85dB @ 10 ft. Visual Alert Green LED Power, Red LED Alarm Diameter 5-39/64' Height 2' Depth 2' Width 5-39/64' Digital Readout No Battery Backup Yes Features Locked Battery Drawer, Latching Alarm Indicator, Silence Feature, End of Life Signal Hush Button Yes Test Button Yes Locking Pin Yes Operating Temp. 40 Degrees to 100 Degrees F Standards UL 217, UL2034, CSFM, NFPA 72, NFPA 720, HUD, FHA Includes Mounting Anchors and Screws, Dust Cover Manufacturers Warranty Length 10 Year Limited This listing is for each.