Suitable for 4-pin line, 12V power amplifier equipment. Enhances your auto sound experience with this bass knob, a general car amplifier volume control designed for precise bass and volume adjustments. This knob features simple in/out connections for easy installation, allowing you to adjust gains and frequency without the need for additional wiring—ideal for ophiles seeking high-quality sound performance. Designed for music enthusiasts and professional sound producers who want convenient control over their car o system on the go. Whether on a long road trip or enjoying music during daily commutes, this bass knob ensures sound tailored to your preferences. The bass knob complements modern vehicle interiors with its sleek design and provides a responsive interface for quick sound adjustments, making it a valuable addition to any car o upgrade. Head size: approximately 5 x 7 cm / 1.97 x 2.76 inches Cable length: 5 m Color: Black Material: Plastic Package Contents: 1 x Car Amplifier Volume Control Cable Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.