The Alpine RUX-KNOB.2 Remote Bass Knob is a subwoofer level control designed for use with Alpine amplifiers. It features a dash mount for easy access and control of the subwoofer level from the front of the vehicle. The sleek design and compatibility with Alpine amplifiers make it a convenient and stylish addition to any car audio setup. Perfect for those looking to enhance their audio experience with precise control over their subwoofer level.