1. On-board 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. The power supply mode supports DC7-60V and Micro-USB 5V; Onboard ESP32 module IO0 programmable buttons; 4.ESP32 supports the use of AD IDE development tools and provides reference programs under the AD development environment; 5.Onboard 1 5V relay, output switch signal, suitable for controlling loads with working voltage within AC 250V/DC30V; Onboard 1 programmable LED and relay indicator. Material: PC+Metal colour: As shown Package Contents: 1 x ESP32-WROOM 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.