USB Computer Volume Controller - 360 degree knob for precise volume adjustments and a one-touch mute function for quick silence when needed. - Stable design with heavy metal blocks in the base and four anti-slip mats on the bottom to prevent movement during use. - Built for durability with a high quality metal shell, a solid rotary shaft, and a removable USB cable for easy maintenance and setup. - Ideal Christmas gift for music fans, geeks, and YouTubers. BT 5.1 Audio Transmitter - Enables effortless pairing with Bluetooth enabled headphones or speakers for wireless listening. - Provides a seamless and quick connection without the hassle of wires. Product Interface Operation Instructions - Supports Windows 10, 8, 7 and Mac systems; plug and play with no driver required. - The adapter is powered by Type-C for convenient plug and play operation. - In external sound card mode, simply plug your headphones into the 3.5 mm headphone jack to listen to your computer audio without needing to reach under the desk. USB Decoding Player - USB decoding supports a wide range of formats including MP3, WAV, WMA, APE, and FLAC. - Features fast forward, rewind, and folder switching for flexible playback. - When listening, press the knob to pause, press again to play. Use Next and Back along with the Volume controls to adjust volume from 0% to 100%. Use scenarios - Desktop computer setup: control system volume precisely from the desk with the comfort of a stable, vibration-free base, ideal for music production, video editing, or gaming. - Wireless listening environment: pair with Bluetooth headphones or speakers for a cable-free experience in home, office, or studio spaces. - On-the-go or shared media playback: use the USB decoding player to access and navigate music folders on a USB drive, with easy playback controls and full volume management.