Compact and Portable: This mini volume control knob is designed for easy handling and portability, perfect for on-the-go adjustments. Universal Compatibility: Equipped with a 3.5mm jack, it's compatible with a wide range of devices, ensuring you can control volume levels on nearly any audio output. Plug and Play: No additional software needed, just connect the knob to your device and start using it immediately. Versatile Use: Ideal for enhancing your audio experience while watching videos, playing games, at weddings, or during conferences. Color: Black Material: Plastic+Metal Package Contents: 1 x Active Volume Control Knob Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.