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, which is convenient for users to reuse all pins in smart home projects. Suitable for breadboard applications. 2 TYPE CONNECTIONS: Pin Header and Screw Terminal. Select according to your needs. DOUBLE-LAYER PCB: The expansion board features a double-layer design. Each pin is connected on both sides, ensuring stable circuit performance and reliable signal transmission. UPDATED VERSION: The board comes fully pre-soldered, no additional soldering required, making it easy to use. Material: Plastic Color: Green Package Contents: 2 x ESP32 Breakout Board Note: Light and display differences may cause slight variations in color. Measurement error allowed is +/- 1-3 cm.