... ZigBee+GPRS IP MODEM is a kind of data terminal device that provides data transfer function by public GPRS ... on M2M fields, such as intelligent transportation, smart grid, industrial automation, telemetry, finance, POS, water supply, environment protection, post, ... 5~35V 2.Stability and Reliability Support hardware and software WDTSupport auto recovery mechanism, including online detect, auto redial ...