Usb hub Usb hub 7 ports Dc plug Compliant with usb(universal serial bus) rev2.0 Support high-speed 480mbps, full-speed 12mbps, low speed 1.5mbps Protection for current overload. Fully compatible with all usb devices.Etc.Scancer, camare, dv, mp3... Supports self-powered and bus-powered mode. Eastern wing international ltd., which is a major and professional manufacturer and exporter in electronic gifts and premium, including digital products, computer accessories, and other promotion gifts, etc. There are usb flash disk, mp3, mp4, digital photo frame, usb hub, mouse, audio speaker, card reader, clock, penholder, calculator, pedometer and radio, etc.