Spare subwoofer volume adjuster This is suitable for car spare tire bass, Not universal. Easily adjust the volume of your car amplifier and subwoofer with this convenient remote controller. Manage your audio system while on the road. Take control of your car audio system with this volume controller. Fine tune the amplifier and subwoofer volume to create the perfect sound for your Upgrade your in car entertainment and enjoy every moment on the road. The cable interface is 6-core crystal head.<br><br>Specifications: Connector: 6-core Colour:black Material:Plastic The actual product may have slight color difference or difference, which will not affect the use<br><br>Package Contents: 1 x Amplifier Bass Knob<br><br>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.