Features:
* Support 3 ways of audio input: PC-USB, Coaxial, and Optical.
* High-quality aluminum alloy case, exquisite and durable.
* Advanced gilded black coaxial RCA for unbalanced analog audio input and for the first output.
* Multi-function knob: clockwise rotation can increase the volume; counterclockwise rotation can decrease the volume.
* 3.5mm Earphone Jack: Be careful to check your earphone jack and choose the correct jack to connect.