Microcontroller / radio SoC development kit: USB (Micro-B/USB-C) for the onboard debugger + native USB, 0.1in GPIO/EXP header rows (UART/SPI/I2C/PWM/ADC), Arduino-shield headers, on-board SEGGER/J-Link or Simplicity debug + SWD/JTAG/Mini-Simplicity connector, u.FL/SMA or chip antenna, coin-cell holder, current-measurement pins and Qwiic/mikroBUS expansion.