Onboard mature and stable ESP32-WROOM-32E module,-capacity 4M Flash. The I/O ports and UART program download ports of the ESP32 module are all led out,which is convenient for secondary development. Onboard AC-DC switching supply module,the supply mode supports AC90-250V. Onboard ESP32 module reset button and IO0 programmable button; ESP32 supports the use of for IDE development and provides reference programs in the development environment. On-board 1-way 5V relay,output switch signal,suitable for controlling loads with working voltage within AC250V/DC30V; On-board indicator,1 programmable LED and relay indicator. Type: Development Board Number: ESP32 Development Board Voltage: AC90-250V color:Green Material:PCB size:80 x 45mm Package Contents: 1 x Development Board 2 x Double Row Needles 1 x Single Row Needle 1 x Single Cap Only the above package content,other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.