Model Number: HM-620PHR-#1896 Brand Name: HEIMAN Key Specifications/Special Features: 2017 hot sale 9 V battery 315 Mhz wireless smoke detectorTest 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 voltage 9Vwireless smoke detector Static current less than10uA Alarm current less than15mA 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