ESP32 development board, onboard ESP32 chip ESP32--D4,Flash size is 4MB. Onboard USB to serial port chip CH343P, ceramic antenna. The whole is a small U disk shape, exquisite and compact, can be used in some special scenarios such as Bluetooth WiFi gateway, as USB Dongle and so on. Colour:Transparent Material:PCB+Plastic PCB board color is random, don't accept the specified color The actual product may have slight color difference or difference, which not affect the use Package Contents: 2 x ESP32 Development Board 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.