with this power amplifier volume control knob. It allows for effortless adjustment of your car's audio levels, ensuring optimal sound quality. The controller is made from plastic, ensuring longevity and reliability. It's an essential accessory for any car audio enthusiast looking to fine-tune their system. Features -Color:Black -Material:PVC -Size:400.00X3.00X3.00cm/157.20X1.18X1.18in -Unique music experience: adjust the subwoofer volume to your preference, creating a unique and enjoyable music experience while driving -Effortless remote control: control the subwoofer volume remotely without leaving your driver's seat, enhancing convenience and driving enjoyment -Adaptable for all situations: great for any driving scenario, whether in the on a road trip, providing great music at your fingertips -Intuitive : the userfriendly design makes it easy to operate, allowing you to effortlessly manage the subwoofer volume - durability: designed for durability, this controller is built to withstand wear and tear, ensuring reliable performance over time Package list: 2 amplifier regulators