The STEVAL-IKR002V5D product evaluation board is based on the SPIRIT1, a very low-power RF transceiver intended for RF wireless applications in the sub 1 GHz frequency band.

SPIRIT1 low power sub GHz transceiver in a standalone RF module tuned for 915 MHz
Modulation schemes: 2-FSK, GFSK, MSK, GMSK, OOK, and ASK
Programmable air data rate: from 1 to 500 kbps
Very low power consumption: 9.8 mA RX and 20 mA TX at +11 dBm
Excellent receiver sensitivity (down to -108 dBm)
Low duty cycle RX/TX operation mode
Automatic acknowledgment, retransmission, and timeout protocol engine
AES 128-bit encryption co-processor
SPI interface for microcontroller