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USR-GPRS232-7S3 is a Low Cost UART TTL GPRS/GSM Module, based on USR-GM3 gprs module.
USR-GM3P is highly-integrated GSM GPS GPRS Module. Users can easily make communication with it among serial device, cellphone and network device.
USR-GM3 is highly-integrated Low Power GSM GPRS Module, used for data transparent transmission.