The Kidde p12040CA is a 120 V AC, wire-in smoke alarm with 9 V battery backup that can function as a stand alone unit or interconnect with up to 24 Kidde devices (of which 18 can be initiating). The Kidde p12040CA provides continuous protection against smoke and fire hazards, even during power outages. This smoke alarm uses photoelectric sensing technology. Photoelectric sensing alarms may detect visible fire particles (associated with slow smouldering fires) sooner than ionization alarms. Ionization sensing alarms may detect invisible fire particles (associated with fast flaming fires) sooner than photoelectric alarms. Leading authorities recommend that both ionization and photoelectric smoke alarms be installed to help ensure maximum detection of the various types of fires that can occur within the home. Model P12040CA/P12040ACA Power Source 120 V AC, 9 V battery backup Sensor Photoelectric Audio Alarm 85dB at 10ft Temperature Range 4.4˚C (40˚F) to 37.8˚C (100˚F) Humidity Range 10%-95% relative humidity, non-condensing Size 12.5 cm in diameter x 3.8 cm depth Weight 0.2 kg Interconnects Up to 24 Kidde devices Warranty 10 year limited
