Connection options: Pin header or screw terminal—choose the method that best fits your wiring needs. Double-layer PCB: Traces on both sides provide stable, reliable signal paths. Signals are less prone to intermittent connections, enhancing overall reliability. Compatibility (important): Designed for the 38-pin narrow ESP32 variant without mounting holes. Not compatible with other ESP32 versions or boards. GPIO expansion: Converts a single ESP32 GPIO into two outputs, making it easier to reuse pins in smart home projects. Also serves as a convenient breadboard-friendly expansion. Compact, practical design: Simplifies prototyping and onboard wiring without taking up much space, keeping your ESP32 projects neat and manageable. Applications: - Smart home projects: drive sensors, relays, or actuators from a single GPIO when board space is limited. - Prototyping and testing: quickly split pins to test multiple components without soldering. - Educational and hobbyist use: easy, reusable GPIO expansion for teaching and tinkering with ESP32 basics.