ESP32 development board, onboard ESP32 chip ESP32-PICO-D4,Flash size is 4MB Onboard USB to serial port chip CH343P, 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 PCB board color is random, don't accept the specified color (Due to different batches, the product appearance and printing may be different, but it will not affect the use) Colour:as shown Material:plastic Package Contents: 1 * USB Dongle Bluetooth Gateway 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.