Features: 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 wiringideal for audiophiles seeking high-quality sound performance. Designed for music enthusiasts and professional sound producers who want convenient control over their car audio system while on the move. Whether on a long road trip or enjoying music during daily commutes, this bass knob ensures your sound is tailored to your preferences. The bass knob complements modern auto interiors with its design and provides a responsive interface for quick sound adjustments, making it a valuable accessory for any car audio upgrade. Specifications: Material: Plastic Head size: Approximately 6 x 4 cm (2.4 x 1.6 inches) Cable length: 5 m Package Includes: 1 x Car Amplifier Gain Adjuster Note: Please allow 1 to 3 cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences between monitor displays, the image may not reflect the actual color of the item.