Universal Security Instruments AC Hardwired 120-Volt Photoelectric Sensor Smoke Detector

Patented technology provides the benefits of both photoelectric and ionization sensing in one alarm. Hardwire, 120V AC alarm with backup battery is suitable for houses, apartments and mobile homes. Fully interconnectable with all USI and Universal 120V alarms using existing wiring and mounting. Meets new laws and legislation, CSFM approved and ETL listed to UL 217 standards. Tamper proof, 10-year sealed backup battery (included) will never have to be replaced throughout the life of the alarm. Mount the bracket to any standard wiring junction box and use the large mounting base to cover imperfections in drywall. Automatic temperature and humidity compensation continuously adjusts to variations in environmental conditions, reducing nuisance alarms. Limited ten year warranty on the battery and alarm. Manufacturer part number MI106S.