This is a low power HAT that adds multi communication functionalities to your Raspberry Pi: GSM, GPRS, and Bluetooth 3.0!
It allows you to fit a 1.8/3V SIM card (check network bands for your network below) and enables your Pi to easily send messages, connect to wireless Internet and transfer data via Bluetooth.
The included GSM and Bluetooth antennas help the board achieve the best possible signal levels, whilst the onboard indication LEDs keep you informed of the board's status.
Note: As per the user guide, a serial module is required to program this board. Waveshare recommends the CP2102 USB UART board.