COMPATIBILITY: Only suitable for 38PIN narrow version ESP32 without mounting holes, not suitable for other versions. GPIO 1 TO 2: This breakout board can expand one GPIO pin of ESP32 development board to two, allowing users to reuse all pins in smart home projects. A convenient breadboard alternative. 2 TYPE CONNECTIONS: Pin Header and Screw Terminal. Select based on your needs. DOUBLE-LAYER PCB: The expansion board features a double-layer design with wiring on both sides. This ensures stable circuit performance, reliable connections, and consistent signal transmission. UPDATED VERSION: Compared to the previous version, this board is fully pre-soldered. No additional soldering required, making it easy to use. Material: Plastic Color: Green Package Contents: 2 x ESP32 Breakout Board Only the above package content is included; other items are not part of the package. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.