Model Number: HM-620PHW Brand Name: HEIMAN Key Specifications/Special Features: Test by hand, low battery warningHush buttonLow standby current, auto reset, ASIC adoptedAnti-light, mothproof, strong adaptability for circumstanceSMT design, high stabilityWireless interconnection, meets EN14604, UL217 Operating voltage110V/220V AC wireless interconnected smoke detector Static current less than 10uA Alarm current less than 15mA Backup battery 9V battery Sound level ≥85dB/3 meters Alarm indication LED flash Alarm sound ≥ 85dB/3m Operating temperature 40 to 100(4 to 38 Humidity 5%-95%RH Code form 2262 or 1527 Detecting area 20 square meters Dimension 128 x 38mm Detecting area 20 square meters