The dual-channel 30A relay development board is a development board based on the ESP32-WROOM-32E module I/O ports are fully led out, supporting DC7-28V/5V power supply Onboard programmable buttons, LEDs and relays facilitate developers to quickly conduct prototype verification and development, and bring more possibilities for loT control scenarios Provide SDKESP-IDF code. After burning the program, you can directly remotely control the onboard LED and relay with your mobile phone, and have functions such as WiFi network configuration and factory reset (contact customer service) ESP32 supports the use of development tools such as for ArduinolDE/VSCode/Tonny: Provide for code, ESP-IDF code (contact customer service) Name:Relay module Applicable:for Smart Home Wireless Control The product appearance and printed words depending on the batch, but this does not affect use Colour:Blue Material:PCB Package Contents: 2 x Relay module 4 x 6P double-row pins 2 x 6P single-row pins Only the above package content, other products are not included. Note: Light reflection 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.