Wire In 120 Volt Smoke and Carbon Monoxide Alarm Price For: Each Alarm Type: Smoke/CO Alarm Power Source: Wire-In Sensor Type: Photoelectric; Electrochemical Mount Type: Wall or Ceiling Interconnectable: Yes Decibel Rating (dB): 85.00 Batteries Included: No Warranty (Years): 7 Voltage: 120V/AC Tamper Resistant: Yes Low Battery Warning: Yes Indicating Light: Yes Maximum Operating Temperature (F): 100 Minimum Operating Temperature (F): 40 Battery Size/Type: 9V Number of Batteries: 1