... -ohm twisted-pair G.703 connections provided, only push the switch at the back panel of the device to adjust ... no rising dust, no strong magnetic field disturbing3.Power SupplyAdapting module power supply with wide voltage range, perfect anti-jamming ... input voltage: -36V-72Vpower: 220V type, input voltage: 175V250V4.Power consumptionTotal power consumption: <5WFE1 InterfaceLine Rate : n×64Kbps,n=1~32 ...