1. Onboard mature and stable ESP32-WROOM-32E module, large-capacity 4M Byte Flash; 2. The I/O port and UART program download port of ESP32 module are all led out, which is convenient for secondary development; 3. power supply voltage DC5V/7-30V; 4. Onboard ESP32 module IO0 programmable button and reset button; 5. ESP32 supports the use of for Arduino IDE development tools, and provides reference programs in the for Arduino development environment Product selling point 1: Wide range of applications 2: Simple to use 3: Small size 4: stable performance 5: Long service life : ESP32 eight-way relay development board is equipped with ESP32-WROOM-32E WiFi&BLE module, all I/O ports are led out, and supports DC5-30V power supply mode. It is suitable for ESP32 secondary development and learning, smart home wireless control and other occasions. Onboard 8-way 5V relay, output switch signal, suitable for controlling loads with working voltage within AC 250V/DC30V. 1 programmable LED and relay indicator onboard. Colour:As Shown Material:Plastic+Metal Package Contents: 1 * Relay 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.