<ul><li>High Efficiency: This USB volume control knob increases productivity and efficiency of working and study, ideal for home, office and school.</li><li>Volume Knob: This multimedia audio controller is designed with a volume control knob which allows you to adjust volume steplessly.</li><li>3 USB2.0 Interfaces: This USB 2.0 hub provides 3 USB 2.0 interfaces for fast data and devices connection.</li><li>Designed for PC: This EDC Essential hub is specially designed for Win PC and for OS X Laptop, multifunction offers more convenience.</li><li>Programmable Shortcuts: This USB 2.0 docking station also features programmable shortcuts for quick and easy media control.</li></ul><br><br>

Heayzoki Multimedia Audio Controller, USB Volume Control Knob with 3 USB2.0 Interfaces, Programmable EDC Essential Hub