... , office, workshop, school, factory, museum, Hospital. bank, electric power Dept. Oil Dept, Railway Dept. financial Dept. Police Dept and so on ... dB (Test distance: 300mm, Surrounding noise:<65db) 3, Stand-by is 4~11mA ;working mode: 150~350mA 4, Wireless frequency :433 ... wireless siren with strobe light(backup li-ion battery optional), an adaptor(or UPS backup adaptor), one door sensor, one PIR motion ...