... meters directly to read the values of analog input, TTL, digital input, pulse counter and so on.The GPRS wireless ... Functions & Features of the GPRS DTU:GPRS Data Transmission, real-time online data transfer, no distance limitation;Embedded 32 bit ARM9 ... Voltage12VDCPower ConsumptionStandby145~65Ma; Registering GPRS Netork:225~65Ma; Transfer data:265~285Ma;GPRS NetworkFrequency: 850 MHz, 900 MHz,1800 ...