Dual GPIO expansion board for Raspberry Pi 400/2/3/4 zero

This GPIO expansion board, designed by Waveshare (Part No. PI400-GPIO-ADAPTER-B), is a dedicated adapter for the Raspberry Pi 400. It duplicates the built-in 40-pin GPIO connector, providing two accessible expansion ports to connect sensors, modules, or other HATs without obstructing the rear of the Pi 400. The header features color-coded pins to facilitate identification and simplify wiring.