The Raspberry Pi GPIO Expansion Board is a versatile add-on for Raspberry Pi 3B, 4B, and CM4. It provides easy access to GPIO pins, allowing you to test their functionality and expand your Raspberry Pi’s capabilities. With onboard ADC/DAC support, LED indicators, and user-friendly features, this expansion board is suitable for both beginners and experienced users.What’s in the box?1 x Raspberry Pi GPIO Expansion Board with PCF8591 ADC