Kidde 21006377 SMOKE & CO ALARM 120V BAT/B Price For: Each Alarm Type: Smoke & Carbon Monoxide Alarm Power Source: Wire-In (Battery Backup) Sensor Type: Electrochemical; Ionization Mount Type: Ceiling Interconnectable: Yes Decibel Rating (dB): 85.00 Batteries Included: Yes Warranty (Years): 5 Voltage: 120.00 Current Type: AC Tamper Resistant: Yes Low Battery Warning: Yes Indicating Light: Yes Battery Size/Type: 9V Diameter (Decimal Inch): 5.7500 Projection (Decimal Inch): 1.7000