1. On-board and stable ESP32-WROOM-32E module, large capacity 4M Flash 2. The I or 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 or DC30V 7. Onboard power indicator, 1 programmable LED and relay indicator. Colour:As shown Material:PCandMetal 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.