Features: Adjustable frequency control. Rotate the controller button to adjust sound frequencies for enhanced audio performance, including deeper bass. Easy to use and convenient. Installation is simple, with detailed instructions included—suitable for both DIY enthusiasts and professional installation. Enhances bass output for car audio systems, improving the in-vehicle music experience and driving enjoyment. Optimizes audio during commutes or daily use, with adjustable bass intensity controlled from the driver’s seat. Compatible with head units, home audio systems, and amplifiers requiring bass control. Specifications: Component: Plastic Size: Approx. 5 x 4 x 3 cm / 1.97 x 1.57 x 1.18 inches Package Includes: 1 x Bass Controller Note: 1. Please allow for a 1–2 cm measurement tolerance due to manual measurement. 2. Screen settings may cause slight color or size variations between the image and the actual product.