... /box AT+GSV SIM900 GSM GPRS module, Quad-band, industrial standard Sim900,SIM900 Simcom wireless module,Simcom modules,modulesGeneral features * Quad-Band ... @ 1800/1900MHz)* Dimensions: 24mm x 24mm x 3mm* Weight: 3.4g* Control via AT commands (GSM 07.07 ,07.05 and ... )* Serial interface * Antenna pad* I2C* GPIO* PWM* ADC GSM/GPRS module SIM340 Wireless modules