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Suitable for 0.9/1.0inch ESP32 ESP-WROOM-32 ESP32-DevKitC development board. It is 38Pins GPIO 1 to 3 expansion board. Terminal spacing 3.5mm/0.14 inches, suitable for 24~18AWG cable connections. Four additional voltage output pins make it easy to connect more devices. After-Sale Service : Thanks for your purchase. If you have any problem, please contact us and we will help you solve them within 24 hours.