The STMicroelectronics X-NUCLEO-S2915A1 expansion board is based on the S2-LP radio and operates in the 915 MHz ISM frequency band. The expansion board is compatible with ST morpho and Arduino UNO R3 connectors. The X-NUCLEO-S2915A1 interfaces with the STM32 Nucleo microcontroller via SPI connections and GPIO pins. You can change some of the GPIOs by mounting or removing the resistors.

S2-LP narrow band ultra-low power sub-1 GHz transceiver tuned for 860-940MHz frequency band
Programmable RF output power up to +27dBm
Modulation schemes are 2-FSK, 2-GFSK, 4-FSK, 4-GFSK, OOK and ASK
Air data rate from 0.1 to 500 kbps
Ultra low power consumption of 7 mA RX and 10 mA TX at +10 dBm