Key benefits Make ESP32 wiring faster and more reliable: choose between pin headers or screw terminals for the connection type you need. Preserve and reuse GPIO pins: the 1-in-2 breakout extends a single ESP32 GPIO to two accessible connection points so you can connect sensors, actuators, or jumpers without losing the original pin. Stable signal and long-term reliability: the double-layer PCB routes each pin on both sides, reducing intermittent contacts and unstable signal transmission. What it does Connection types: provides both pin header and screw terminal options so you can pick the best connection method for prototyping or permanent installs. GPIO 1 IN 2: duplicates one ESP32 GPIO into two terminals for easier sharing and reuse of pins in multi-device setups. Double-layer PCB construction: each pin is wired on both layers for improved circuit stability and reliable switching contact. Important compatibility and form factor Specifically designed for the 38-pin narrow version ESP32 development board without mounting holes. Not compatible with other ESP32 versions or boards with a different pin layout or mounting holes. Compact, narrow 38-pin format matches the target board for a direct fit. Performance and reliability Dual-side wiring minimizes poor contact and reduces the chance of intermittent connections during both prototyping and deployment. Choice of screw terminals or pin headers makes the board flexible for field wiring or breadboard-style work. Acts as a reliable alternative to pegboards when you need repeatable, solder-free connections. Typical use scenarios Smart home projects: share a controller GPIO between a sensor and a relay module without losing the original connection point. Rapid prototyping: use pin headers for breadboard and jumper testing, then switch to screw terminals for a secure, longer-term install. Small automation or sensor arrays: conveniently split a GPIO to feed two devices or to add inline test points without modifying the ESP32 board. What to check before buying Confirm your ESP32 is the 38-pin narrow version without mounting holes. This breakout is only suitable for that specific model. Decide whether you need screw terminals, pin headers, or both for your intended wiring method. This breakout board provides a simple, dependable way to expand a single GPIO and improve wiring options for the 38-pin narrow ESP32 (no mounting holes) while delivering more stable connections through double-layer PCB routing.