About the ESP32 Breakout Board: Please Note Wide Compatibility: The breakout board is only suitable for the 38PIN narrow version of ESP32 without mounting holes. Note: Not applicable to ESP-WROOM-32 DevKit V1 version. Make sure your esp32 board pin width is the same as the breakout board pin width Important: ESP32 Breakout Board GPIO 1 in 2 is only compatible with 38 Pin ESP32S ESP32 The module is safe, reliable and scalable to various applications. The expansion board adopts a double-layer design, with a pin on both sides. Stable and very reliable. Provides good contact and stable signal transmission for your esp32 board The AITRIP breakout board can expand one GPIO pin of the ESP32 board to two, great for you to reuse all the pins, a great tool for your smart home projects. Nice breadboard alternative ESP32 Breakout Board can expand 1 GPIO pin of esp32 development board to 2. Great for users to reuse all pins in smart home DIY projects. Excellent breakout board Product Description Specification: Size: 7.8*6.3*1cm/3.07*2.48*0.4in PCB material: high quality FR-4 material Number of PCB layers: 2 layers PCB thickness: 1.6mm Pad: Tin Plated Note: Only for 38 Pin ESP32 development board. pack: 1 x ESP32 breakout board