BRK SMICO100 AC Smoke and Carbon Monoxide Alarm, Carbon Monoxide Smoke, Removable Battery, Battery Backup G5840326 Nails and Most Hard Wire Nails and Most Hard Wire Jaw Bend 0 Degrees Wire Stripper No Insulated No Spring Return No Nose Type Oval Tether Style Tether Capable Weight 9 The new design features a more robust cage and internal parts Ionization Market Residential Number of Batteries Required 1 Minimum Operating Temperature 40 Degrees F Battery Locking Pin Yes Battery Backup Yes Operating Voltage 120V AC Battery Chemistry Alkaline Number of Tandem Detectors 12 Country of Origin Mexico SMICO105 AC Alert Type Sound Test Button Yes Volume Level 85 dB @ 10 ft Communication Protocol Hardwired Interconnect For Location Indoor Includes Mounting Hardware Yes For Environment Bedroom Operating Frequency 60 Hz Humidity Operating Range 10% to 95% RH Battery Location Side Receiver Range 10 ft Sensor Type Electrochemical