The XE121 evaluation board features an on-board A121 pulsed coherent radar sensor and the possibility to add up to four additional A121 PCR sensors via flat flexible cable (FFC) to the XS121 satellite boards. The XE121 evaluation board can not be used standalone since it is not equipped with an MCU. It is designed to be compatible with the XC120 connector board, Raspberry Pi, and STM Nucleo-64 or Nucleo-144 development boards. The most straight-forward and optimized way to evaluate the A121 PCR sensor is to connect the XE121 evaluation board to the XC120 connector board which enables evaluation of the radar sensing using the Acconeer “Exploration Tool”.