Smoke alarm. 60 Hz at 120 VAC wire-in. 0.04 A (standby/alarm). 40 to 100°F temperature range. 85 dB at 10 ft audio alarm. Electronically simulates the smoke condition, causing the unit to alarm test button. Automatic when smoke clears alarm reset. Up to 18 units of which 12 can be smoke alarms interconnections. Dual chamber ionization sensor. Constant green LED AC power. Intermittent red LED DC power (9120BA). Red LED out remote alarm. Red LED flashes rapidly local alarm. Green LED flashes 2 seconds on/2 seconds off after local alarm stops latching alarm. Dual ionization sensing technology. Smart technology system. Latching alarm indication. Single button test/silence. Locking features.