Feature: 1. ESP32 Development Board: Onboard mature and stable ESP32 module, with large capacity 4M Byte Flash, reliable for use. 2. Convenient Development: The IO port and the UART program download port are all led out, convenient for secondary development. 3. Programmable and Resettable: Onboard ESP32 module IO0 has programmable button and reset button, convenient for operation. 4. 4 Way 5V Relay: 4 way 5V relay onboard outputs switch signal, suitable for controlling the load whose working voltage is within AC250V DC30V. 5. Multi Usage: Equipped with WiFi and BLE modules, supports DC5-60V power supply, can be used for secondary development and learning, smart house wireless control, etc. Specification: Item Type: ESP32 Development Board Material: PCB Package List: 1 x ESP32 Development Board 2 x 10 Double Row PIN 1 x 6 Single Row PIN 1 x Single Line Cap