The Spirit Click Board™ carries the SP1ML 868MHz ultra-low-power RF module. The board is designed to use a 3.3V power supply and 3.3V or 5V I/O voltage levels. It communicates with the target MCU over the UART interface, with additional functionality provided by the following pins on the MikroBUS line: PWM, RST, CS.
It can be used to wirelessly send and receive UART data.