... GSM GPRS module, Quad-band, industrial standard Sim900,SIM900 Simcom wireless module,Simcom modules,modulesGeneral features * Quad-Band 850/ 900/ 1800 ... July ,2010)* Embedded AT (available at Q3,2010) Specifications for Voice * Tricodec – Half rate (HR) – Full rate (FR) – Enhanced Full rate ... * Antenna pad* I2C* GPIO* PWM* ADC GSM/GPRS module SIM340 Wireless modules