1. On-board and stable ESP-12F WIFI module with 4MB flash capacity. 2. WIFI module input/output port and UART program download port are accessible for secondary development. 3. Built-in reset button for the WIFI module. 4. ESP-12F compatible with development tools such as ECLIPSE and IDE. 5. 2 to 5V relay with output switch signal, suitable for controlling AC voltage up to 250V or DC30V. Integrated power indicator, one programmable LED, and relay status indicator. Color: Green Material: PCB Size: 78x47mm Package Contents: 1 x ESP8266 ESP-12F WIFI Relay Module Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3cm.