Kenwood's optional bass boost remote controller, designed exclusively for the KAC-X1R, KAC-X10D, and KAC-X20 Excelon amplifiers. You can dial in up to 18 dB of boost for a formidable kick, then adjust the center point of the boost between 40 and 200 Hz to find the sweet spot in your vehicle. The wired remote includes a 19.5-foot plug-in cable. Dimensions: 2-3/4"W x 1-1/4"H x 2-1/16"D