Suitable for 4-pin line, 12V power amplifier equipment. Enhance your car audio experience with this bass knob, general volume control for car amplifiers, designed for precise bass and volume adjustments. This knob features simple in/out connections for easy installation, allowing you to adjust gain and frequency without the need for additional wiring - perfect for audiophiles seeking the best possible sound quality. Suitable for music enthusiasts and professional audio producers who need convenient control over car audio on the go. Whether you're driving a long road trip or enjoying your favorite tunes during your daily commute, this bass knob ensures your audio is tailored to your preferences. This bass knob not only complements modern cars with its design, but also offers a responsive interface for quick audio adjustments, making it an essential accessory for any car audio upgrade. Size: approx 5x7cm/1.97x2.76inch Cable length: 5m Color: Black Material: Plastic Package Contents: 1 * Car Amplifier Volume Control Cable 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.