- Compatibility: Only suitable for 38PIN narrow version ESP32 without mounting holes; not compatible with other ESP32 versions. - Connection options: Two types available - Pin Header or Screw Terminal. Choose according to your project needs. - Double-layer PCB design: The expansion board uses a double-layer PCB with one pin wired on both sides, providing a stable circuit and reliable signal transmission. - GPIO expansion: Expands one ESP32 GPIO pin into two outputs, making it easier to reuse pins in projects and on a breadboard. - Key attributes: compact, robust double-layer PCB construction, reliable connections, and flexible wiring options for ESP32 development boards. - Practical applications: - Prototyping ESP32 projects that require extra I/O without sacrificing layout or performance. - Quick upgrades to existing ESP32 setups by converting a single GPIO into two usable signals. - Education and testing environments where stable connections and versatile wiring (header or screw terminal) are beneficial. - Notes: This accessory is designed to improve GPIO availability while maintaining signal integrity on the stated ESP32 variant.