Hardwire Photoelectric, Smoke Alarm. Photoelectric Technology: Better at detecting slow smouldering, fires. 120V AC Direct-Wire ... Interconnects with up to 24 units, of, which 18 can be initiating. 9V Battery Backup (included) ... Continuous protection in case, of power failure. Test Button ... Tests circuitry and verifies alarm operation. Low Battery Indicator ... Warning chirp sounds when battery, needs replacement. Interconnectable ... ANY unit that senses a problem automatically, triggers ALL units throughout the home immediately, allowing, extra time for escape., Product dimensions: 6 x 6 x 1.5 deep, Colour / Case Pack: White / 6 units, Electrical Rating: 120V AC, 60Hz, 60mA, 9V Battery Backup, Wiring: Quick connect plug with 8 pigtails, Audio Alarm: 85dB, Temperature Range: 40..F (4.4..C) to 100..F (37.8..C), Humidity Range: Up to 85% relative humidity, Sensor: Photoelectric, Weight: 0.45lb
