Feature:1. Designed for PC: This EDC Essential hub is specially designed for Win PC and for OS X Laptop, multifunction offers more convenience.2. Volume Knob: This multimedia audio controller is designed with a volume control knob which allows you to adjust volume steplessly.3. 3 USB2.0 Interfaces: This USB 2.0 hub provides 3 USB 2.0 interfaces for fast data transmission and devices connection.4. Programmable Shortcuts: This USB 2.0 docking station also features programmable shortcuts for quick and easy media control.5. High Efficiency: This USB volume control knob increases productivity and efficiency of working and study, ideal for home, office and school.Specification:Item Type: EDC Essential HubMaterial: ABSColor: Black GoldInterface: USB2.0 x 3, Volume Knob, Volume Button.Package List:1 xEDC Essential Hub1 x USB Cable