Onboard and stable ESP32-WROOM-32E module, large capacity 4M BYTE FLASH The I/O port and UART program download port of the ESP32 module are all led out to facilitate secondary development Onboard AC-DC switching power supply module, power supply mode supports AC90-250V Onboard ESP32 module reset button and IO0 programmable button ESP32 supports the use of for IDE development tools, providing reference programs under for development environment Power supply port: 90-250V AC MCU: ESP32-WROOM (SMD) Material: PCB Color: blue Package Contents: 1 x Relay Module 2 x 10P Double-row Pins 1 x 6P Single-row Pin Only the above package content, other products are not included. Note: Light reflection 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.