Easily adjust the volume of your car amplifier and subwoofer with this convenient remote controller. Manage your o system while on the road. Customize the sound output to suit your preferences and enjoy a listening experience. Designed for car owners who appreciate quality sound, this versatile volume controller is compatible for car o systems and subwoofers. Perfect for those seeking to optimize their in car o experience. Whether you are driving in on the highway, or going on a long trip, this remote volume controller is a practical addition to your car. Adjust the volume easily and safely without distractions, ensuring a pleasant journey. Take control of your car o system with this remote volume controller. Fine tune the amplifier and subwoofer volume to create the perfect sound for your Upgrade your in car entertainment and on the road. Colour:Black Material:ABS Package Contents: 1 x Amplifier Bass Knob 1 x cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.