Features: brand new and high quality Only suitable for 38Pin narrow version ESP32 without mounting holes Extending 1 GPIO pin to 2 ,which is convenient for users to reuse all pins in for smart home projects. Nice breadboard alternative. 2 type connections: Pin Header & Screw Terminal. Just select them according to your purpose. The expansion board is a double-layer board. the circuit is stable and highly reliable, and there will be no poor circuit contact and unstable signal transmission. Compared with the previous version, the board of this version has been welded- completely. No need to solder parts by yourself, which is very convenient to use. Specifications: Item: ESP32 Expansion Board Suitable for: 38Pin narrow version PCB material: high quality FR-4 Material Number of PCB layers: 2 layers PCB-Board Thickness: 1.6mm Pad: Tin Plated Dimensions: approx 7.7 x 6.3 x 1.05cm/3.03x2.48x0.41in Package Includes: 1PC x ESP32 Expansion Board note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment