The USI Electric MI106S Hardwired Smoke and Fire Alarm uses patented Universal Smoke Sensing Technology to respond quickest to BOTH fast-flaming fires and slow smoldering fiers to protect your family against deadly threats in the home. U.S.S.T. provides the benefits of both photoelectric and ionization alarms in one device. Perfect for new or replacement installations, the 120-volt AC hardwired alarm is suitable for houses, apartments and mobile homes. This alarm is fully interconnectable with all USI and Universal 120V alarms using existing wiring and mounting. Quick Find alarm origination identifies the first alarm to sound in an interconnected system and the single silence/test button temporarily quiets nonemergency alarms. Auto sensitivity calibration also provides superior nuisance alarm protection and creates consistency in alarm sensitivity. This alarm has additional automatic features including a self-diagnostics check and a sensitivity adjustment for changes in temperature or humidity. The 10 year Permanent Power tamper-proof sealed battery continues protection in the event of a power outage. Mount the bracket to any standard wiring junction box and use the large mounting base to cover imperfections in drywall. The plastic dust cover protects the alarm and tamper-resistant locking feature prevents unwanted alarm removal. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling. The USI Electric MI106S Hardwired 2-in-1 Universal Smoke Sensing Technology Smoke and Fire Smart Alarm comes with a 10 year limited warranty on both the battery and the alarm. USI Electric is a subsidiary of Universal Security Instruments Inc., a U.S. based manufacturer of high quality, easy-to-install home safety products. Founded in 1969, Universal Security Instruments has over 40 years of heritage in providing home safety products for families. With state-of-the-art manufacturing facilities, Universal Security Instruments continues to launch revolutionary new products and technologies with the mission of always working to keep families protected.