1. On-board mature and stable ESP32-WROOM-32E module, 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 supply mode supports DC7-60V and -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+Metalcolour: As shownPackage Contents:1 x ESP32-WROOM development boardOnly 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.