4 port USB powered HUB, you can charge your phone even if the computer if off by using your own power adapter, DC power hole is offered. Transform one of your computer's USB port into four with super speed. You can finish your work whatever you transmit HD movie or high-definition photos in a short time. Data transfer speeds up to 5 Gbps, also supports low speed (1.5 Mbps) / full speed (12 Mbps) / high spped (480 Mbps).