... 4.Professional manufacture 5.Fast Delivery time 4 Port USB HUB Feature :1) USB HUB with 4 port, USB2.0 Version, compatible ... , audio-system, display, U disk,5) Single chip integrated USB HUB controller with embedded proprietary processor6) 4 ports, and power up to ... 500mA each port7) USB bus power Supply ,No external power supply ...