Onboard and stable ESP32-WROOM-32E module, large capacity 4M Flash. The I/O port and UART program download port of ESP32 module are all led out, which is convenient for secondary development. Onboard ESP32 module IO0 programmable button and reset button. ESP32 supports the use of for IDE development tools and provides reference programs in the development environment. On-board 2-way 5V relay, output switch signal, suitable for control and control working voltage is AC Load within 250V/DC30V; 1 programmable LED and relay indicator onboard. Colour:blue Material:PCB Size:74.3 x 48.1mm Package Contents: 1 x Development Board 2 x Double Row Needles 1 x Single Row Needle 1 x Single Line Cap 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.