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Contact SupplierOperating Voltage (Stand Alone) : +9VDC Battey Standby Current : < 200μA(for Both) Operating Current (Stand Alone) :9mA Detecting Range : 20Sq.M Working Temperature : -10°C ~ 60°C Working Humidity : 95% RH Mounting : Ceiling Output : NC/NO(Optional), Buzzer(Optional), Pulse Size:45(H)x104(D)mm Weight:245gm