1. On-board and stable ESP32-WROOM-32E module, large capacity 4M Flash; 2. The I/O port and UART program download port of the ESP32 module are all led out to facilitate secondary development; 3. Onboard AC-DC switching power supply module, power supply mode supports AC90-250V; 4. Onboard ESP32 module reset button and lO0 programmable button; 5. ESP32 supports the use of Ad IDE development tools and provides reference programs in the Ad development environment; 6, Onboard 1 5V relay, output switch signal, suitable for controlling loads within AC 250V/DC30V; 7. Onboard power indicator, 1 programmable LED and relay indicator. Colour:As shown Material:PC+Metal Package Contents: 1 x ESP32 Single Relay Development Board Only the above package content, other products are not included. Note: Light 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.