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. Ideal breadboard alternative. 2 TYPE CONNECTIONS: Pin Header & Screw Terminal. Select according to your needs. DOUBLE-LAYER PCB: The expansion board is a double-layer board. One pin is wired on both sides. Therefore, the circuit is stable and highly reliable, with no poor contact or unstable signal transmission. UPDATED VERSION: Compared with the previous version, this board has been fully soldered. No additional soldering required, making it very convenient to use. Material: Plastic Color: Green Package Contents: 2 x ESP32 Breakout Board Only the above package content, other products are not included. Note: Lighting and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowed error is +/- 1-3 cm.