: It is fully compatible with the ESP8266 ESP-12E development board. It can expand one GPIO pin on the development board to two, which greatly facilitates usersto reuse pins for large-scale smart home projects. Specifications: PCB material: high quality FR-4 material PCB layers: 2 layers PCB thickness: 1.6mm Pads: tin plated GPIO 1 into 2: This expansion board can expand one GPIO pin of Development Board to two, which is convenient for users to reuse pins for large-scale smart home projects. Double-Layer PCB: The expansion board is a double-layer board. One pin is wired on both sides. Therefore, the circuit is stable and highly reliable, and there will be no poor circuit contact and unstable signal transmission. 2 Type Connections: Two connection methods: Pin Header Connector & Screw Terminal. Just select them according to your purpose. Package included: 4pcs ESP8266 Breakout Board

Package included: 4pcs ESP8266 Breakout Board. Two connection methods: Pin Header Connector & Screw Terminal. The expansion board is a double-layer board. One pin is wired on both sides. Therefore, the circuit is stable and highly reliable, and there will be no poor circuit contact and unstable signal transmission. GPIO 1 into 2: This expansion board can expand one GPIO pin of Development Board to two, which is convenient for users to reuse pins for large-scale smart home projects. About ESP8266 Breakout Board for ESP8266 ESP-12E; It is fully compatible with ESP8266 ESP-12E.