Features: 1.Plug Play: USB 3.0 port, expand one computer USB port to four USB ports, plug and play, no need to install drivers 2.High Speed Propagation: Protects equipment safety, built in current and overload protection settings to protect the safety of connected equipment and extend the life of the USB hub 3.Protect Safety: High speed data transmission, it can get a data transmission speed of 5Gbps, so that you can transfer files and videos at a faster speed 4.Compact Design: Small and compact design, lightweight design convenient for people to put on and carry, suitable for work and travel 5.Parameters: 5Gbps transmission rate can be connected to 1TB hard disk, mouse, keyboard, USB flash disk, etc. No external power supply, no drive, plug and play specification:Item Type: USB Hub Material: ABS Line Length: Approx. 30cm / 12in Output Interface: 4 x USB3.0 Input Interface: USB3.0 Type-A Compatibility: For Windows Series, for OS X,for Linux, Etc. Seven Fold Protection: Overvoltage, Short Circuit, Overcurrent, Temperature, Overcharge, over Discharge and over Power Protection. PackageList:1 xUSB Hub NoteManual measurement error 1?2cm