€¢ Hush® feature temporarily silences nuisance alarms €¢ Red LED flashes every 30-40 seconds to indicate thatthe smoke alarm is receiving power €¢ Test button tests unit€™s electronic circuitry; horn and battery function €¢ Battery operated (9V battery included) protects even during power outages €¢ Tamper resist locking pin helps deter from theft or tampering €¢ Low battery indicator - Smoke alarm will chirp in the event of a low battery The Kidde i9060CA battery operated smoke alarm is a single station smoke alarm designed to alert you and your family to the dangers of smoke and fire. This unit uses a 9V battery; protecting you and your family even during a power outage. The i9060CA includes a tamper resist locking pin that helps deter battery and alarm theft and a Hush® control feature that will temporarily silence nuisance alarms. This alarm uses ionization sensing technology. Ionization sensing alarms may detect invisible fire particles (associated with flaming fires) sooner than photoelectric alarms. Photoelectric sensing alarms may detect visible particles (associated with smoldering fires) sooner than ionization alarms. Kidde strongly recommends that both ionization and photoelectric smoke alarms be installed to help insure maximum detection of the various types of fire that can occur within the home."