This product combines a volume controller, USB sound card, BT audio sender and a MP3 music player into one compact unit.

The operation mode button on this unit allows users to effortlessly switch from volume control mode to, sound card mode or BT mode.

A handy external device for fine-tuning computer sound output through a simple rotary dial instead of using mouse or on-screen slider.

It gives you 2 simultaneous AUX outputs for hookup with speakers and headphones at the same time, plus the ability to send your computer audio to BT headphone or a BT speaker/soundbar.

Users can quickly adjust the computer volume or the sound volume of the speaker or headset connected through its 2 AUX audio outputs.

Easy Plug And Play Operation
Easy plug and play operation with no driver needed and no software installation required.

Works instantly on Windows, mac OS, and Linux.

It is a perfect desktop volume control for your computer sound in gaming, online music and so on.

4 Functions in One Device
This external desktop device combines the following functions into one compact unit.

Volume Controller: easy rotary dial for fast and precise volume adjustment for computer.
USB Sound Card: provides 2 of 3.5mm AUX stereo outputs for additional hookup.
BT sender: send music from your computer to BT headphones or speakers.
MP3 Player: Plays music directly from USB flash drives with no computer hookup needed.

The operation mode button on this unit allows users to effortlessly switch from volume control mode to Sound Card mode or BT mode.

LED indicators in red, blue or green color for visual confirmation of operation mode selected.

Fast Volume Adjustment
It is a handy external device that lets you adjust or fine-tune your computer system sound output through a simple rotary dial instead of using your mouse or on-screen slider.

USB Sound Card With Dual AUX Outputs
When switching to the sound card mode, the 2 AUX outputs on this desktop device are ready hookup with mix of headphone, multimedia speakers earphone, soundbar or audio receiver.

And users can control the volumes of 2 AUX outputs at the same time.

Stand Alone MP3 Audio Player
When disconnected with computer, this desktop unit can function as a stand alone MP3 audio player.

By Insert a USB flash drive with MP3 or audible music files in other formats, and it will play your music files automatically.

Great for standalone use with no computer needed.

This device supports a variety of audio file formats including MP3, WMA, WAV, APE, FLAC, AAC, MP4 , M4A, AIF and AIFC.

It also offers 2 push buttons for the fast-forward/next channel and rewind/last channel control, allowing you to enjoy your music like a regular MP3 player.