1、Based on the for Raspberry Pi Pico interface design, it can be inserted directly after soldering the pin headers, or connected via a flat cable. 2、Extend 2 sets of 2x20 pin headers for easy access to multiple for Raspberry Pi Pico expansion boards. 3、Clear pin function silk screen is marked on the front, and the marking is clear and convenient for wiring use. 4、Thicken PCB board, reduce wiring workload, simplify product assembly, welding, and debugging work. 5、Using immersion gold technology, the appearance is elegant and generous, seamless, stable and safe to operate. 1 x External Expansion Board Item Type: External Expansion BoardMaterial: PCBWorking Voltage: ≤5VSize(L x W): Approx. 103.5 x 55mm / 4.1 x 2.2inPurpose: For Raspberry Pi Pico interface external expansion board, convenient to connect multiple for Raspberry Pi expansion boards for various experiments