1. Onboard mature and stable ESP-12F WIFI module, capacity 4M FLASH; 2. The I/O port of the WIFI module and the UART download port are all led out to facilitate secondary development; 3. Onboard WIFI module reset button; 4. ESP-12F supports development tools such as / IDE; 5. Onboard 2 5V relays, output switch signal, suitable for controlling the working voltage of AC Load within 250V/DC30V; 6. Onboard power indicator, 1 programmable LED and relay indicator. Type: ICs Model Number: ESP8266 ESP-12F WIFI Relay Module Application: Computer Operating Temperature: ESP8266 ESP-12F WIFI Relay Module Supply Voltage: 5V/8-80V colour:Green Material:plastic size: 78 x 47mm Package Contents: 1 x Relay Switch Board Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.