Feature: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 or 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 or 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 ModuleMaterial: PCBPower Supply: DC 5-30V.Package List:1 x8 Channel Relay Module2 x Double 9 Pin Header1 x Single Row 6 Pin Header1 x Jumper Cap