1. On-board mature and stable ESP32-WROOM-32E module, large capacity 4M Byte 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 RST 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 shownMaterial:PC+MetalPackage Contents:1 x ESP32 Single Relay Development BoardOnly the above package content, other products are not included.Note: Light shooting 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.