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This 3 in 1 small module with various functions that sending voice and short message, browsing webpages and collecting GPS. Support SIM network type: GSM(2G)/TD-SCDMA(3G)/WCDMA(3G)/TD-LTE(4G)/FDD-LTE(4G),not support CDMA1X(2G)/EVDO(3G) Specification: Size:2.36" * 1.57" Support Voice and Short Message Package: 1 * A7 Module; 1 * 3m GPS Antenna; 1 * 2m GSM/GPRS Antenna Connection with Arduino A7 Module ARDUINO UNO GND ------> GND U_TXD ----> 0 U_RXD ----> 1 Download the material from drive.google.com/open?id=0ByLlBkJVmxooZmM2UjAyWmdlbW8