... contact, Lightning protection, Electrostatic protection, Over current protection), 3-Phase AC Power Opto isolated inputs to detect the Electricity A, B, ... battery that can last 24hours,when battery with low voltage will alert user by SMS;8.Supports 8 digital ... X8USB Cable x1Specifications of the GSM GPRS Power Facility Alarm S250:Rated Voltage: 110 to 220VAC,2AStandby current: 5mAWorking temperature ...