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This GPIO extension board is specially designed for Raspberry Pi series boards, perfectly supporting Raspberry Pi 4B, 3B+ and 3B models. It expands the onboard GPIO pins completely with clear marking, making wiring and circuit testing much simpler. Suitable for robot car assembly, sensor connection, electronic experiment and programming development projects. The module features stable circuit design and easy installation, a must-have accessory for Raspberry Pi beginners, makers and DIY enthusiasts to complete various intelligent hardware production and test tasks.