This is a 4 port USB hub for Raspberry Pi, provides more UsE capability to your pi, what's more,it features UsB to UART converter for easy serial communication. it can work with various versions of the Pi, and the size of the board is designed to perfectly fit the Zero / Zero 2W / Zero W /Zero WH 4 USB Ports.compatible with USB 2.0/1.1 Onboard USB to UART, with enable / disable switch, convenient for Raspberry Pi serial debugging and avoiding conflict Onboard multi indicators, for monitoring the status of power, uSB to UART, and each usB port Colour:Blue Material:PC Package Contents: 1 x USB to UART Module(The printed words and labels on the products may differ due to different product batches, but this will not affect the use) 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.