Suitable for 4pin line,12v power amplifier equipment.<br> Enhances your Auto Sound experience with this Bass Knob, General car amplifier Volumes control designed for precise bass and Volumes adjustments.<br> This knob features simple in/out connections for easy installation, allowing you to adjust Gains and frequency without the need for additional wiring - perfect for audiophiles seeking best sound quality.<br> Suitable for music enthusiasts and professional sound producers who demand convenient control over their car's Sound while on the move. Whether cruising on a long road trip or enjoying your favorite tracks during daily commutes, this bass knob ensures your Sound is tailored to your preferences.<br> This Bass Knob not only complements modern auto interiors with its design but also offer a and responsive interface for fast Sound adjustments, making it essential accessory for any Auto Sound upgrades.<br> Head size:about 5x7cm/1.97x2.76inch<br> Cable length:5m<br> Colour:Black<br> Material:Plastic<br> Package Contents:<br> 1 * Car Amplifier Volume Control Cable<br> Only the above package content, other products are not included.<br> 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.