This module adopts the CH334 4 interface USB2.0 hub chip solution from Qinheng, with stable performance and a maximum measured mission speed of around 40MB/S. The module is equipped with TYPE-C and USB-A interfaces as input options, and the output terminals are all USB-A interfaces, which can be used for USB peripherals such as USB flash drives, portable hard drives, mice and keyboards, microcontroller USB serial communication, etc. Due to the limited power supply of the USB2.0 interface, the module is also equipped with an external power supply interface to meet the power supply needs of multiple peripheral connections. Module Features: 1. Support external power supply for DC5.5 * 2.1 interface 2. Flip the switch to switch between USB port power supply or external power supply 3. TYPE-C and USB-A dual interface inputs are optional (choose one, do not connect both) 4. 4 USB-A output interfaces Parameter: Module type: Functional module External input voltage: 5V When using external power supply, the voltage difference between the external power supply and the USB port should be within 0.4V fer speed: tested at around 40MB/S (large file fer test) Suggest TYPE-C as front-end input Color: black Material: PCB+Metal Package Contents: 2 * USB2.0 HUB 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.