Features 1、Stable ESP32 Module: The onboard ESP32-WROOM-32E module with large capacity 4M Byte Flash, supports the use of development tools and provide reference programs in the development environment. 2、For Development: The I/O ports and UART program download ports of the ESP32 module are all exported, making it convenient for secondary development. 3、Better Design: On board ESP32 module programmable buttons and reset buttons, on board 1 programmable LED and relay indicator light. 4、Applicable Scene: On board 8 circuit 5V relay, output switch signal, suitable for controlling loads with working voltage within AC 250V and DC 30V. 5、Reliable in Use: The ESP32 8 channel relay development board is equipped with the ESP32-WROOM-32E WiFi and BLE module, and all I/O ports are led out, supporting DC 5-30V power supply. Suitable for ESP32 secondary development learning, smart home wireless control, and other occasion. Specification Item Type: 8 Channel Relay Module Material: PCB Power Supply: DC 5-30V Package List 1 x 8 Channel Relay Module 2 x Double 9 Pin Header 1 x Single Row 6 Pin Header 1 x Jumper Cap