Practical Office 4 Multi-Function Keyboard Camera

Practical Office 4 Multi-Function Keyboard CameraProduct details Interface Type:Usb 3.0 Ports:4 Origin:Cn(origin) Funtion:Reader Standard:Usb 3.0 Certification:None Length:15cm Package:No Plug Standard:None Device that expands to multiple interfaces The USB hub is divided into: 1. Active type: It can regenerate and amplify the signal on the connected network medium,which can make the connected medium length reach the maximum effective length, and it needs a power supply to work. At present, most HUBs are of this type. 2. Passive: It only acts as a connector, it can work without power supply, which is rare in the market. 3. Hybrid: You can connect multiple types of cables, such as coaxial and twisted pair.