Wireless fire smoke detector alarm， easy to install. Adopt the special structure design and ASIC， has the dustproof， mothproof and anti outside light interference features etc. Photoelectric sensor for early detection from all directions. Alert and warn people stay far away from danger field when it detected smoke. General purpose ideal for all areas: house， shop， hotel， restaurant， office building， school， bank， library， computer house and storehouse etc.Features:- Wireless fire smoke detector alarm， easy to install- Photoelectric sensor for early detection from all directions - Adopt the special structure design and ASIC， has thedustproof， mothproof and anti outside light interference feature etc. - With alarm test button- Ideal for house， shop， hotel， restaurant， office building， school， bank， library， computer house and storehouse etc. - Alert and warn people stay far away from danger field when it detected smoke. Voltage: DC 12V Alarm Volume: 10 feet to 85dB Power: 1 x 9V battery (Included) Alarm Indicator: Red LED Working Temperature: -10 ~ 50 centigrade degree Environment Humidity: <= 95%RH Detecting Area: 20 square meters Color: WhiteProduct Size (Dia. x H): Approx. 107 x 35mmNet Weight: 116g (with battery)Package Weight: 135gPackage Dimension (L x W x H): 107 x 105 x 36mmPackage Include:1 x Smoke Alarm 1 x User Manual2 x Screw