1. Compatible with USB2.0/ 1.1. 2. No extemal power supply. 6. Built-in LED power indicator. USB 3.0 HUB 1.Compatible ... with USB2.0/1.1. 2.Support for hot-swappable ... , CATV Coaxial Cable, Power Board.Categories of computer electronics: Headphone, Bluetooth Headphone, Earphone, Speaker, Mouse, keyboard,Game Headphone and Keyboard, Game ...