If you have any questions about our wireless earbuds, please feel free to contact us and we will get back to you within timely LC-Relay-ESP12-1R-D8 single way relay development board carry on ESP-12F WiFi module I/O port is fully extracted, support DC8-80V/USB 5V and other power supply methods. Supply development environment reference code, suitable for ESP8266 secondary develop learning, smart home wireless control and other occasions. Onboard mature and stable ESP-12F WiFi module ,High capacity4M Byte Flash. Reserve GPIO for ESP-12F. Reserve UART firmware update interface. Onboard WiFi module RST reset button. Onboard 1 channel 5V relay. color: blue Material: PCB Model: LC-Relay-ESP12-1R-D8 Work Voltage:DC8-80V/USB5V WIFI IC: ESP8266 Communication Protocol:UART Load voltatge:AC 250V or DC 30V(Max) Load current:10A(Max) Work Temperature:-25?~85? Work Humidity:5%~95%RH Size:59*48*19mm Package: 1pcs WIFI Relay Switch Module 1pcs 2*7Pin 2.54mm Male Pin 1pcs 2*6Pin 2.54mm Male Pin 1pcs 5Pin 2.54mm Male Pin 1pcs 2.54mm Jump Cap Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. If you have any questions about our wireless earbuds, please feel free to contact us and we will get back to you within timely