... /box AT+GSV SIM900 GSM GPRS module, Quad-band, industrial standard Sim900,SIM900 Simcom wireless module,Simcom modules,modulesGeneral features * Quad- ... power consumption: 1.5mA(sleep mode)* Operation temperature: -40°C to +85 °C Specifications for Fax* Group 3, class 1 ... )* AMR – Half rate (HR) – Full rate (FR) Interfaces* Interface to external SIM 3V/ 1.8V* analog audio interface* RTC backup ...