Black inline volume control with 3.5mm jack

This is an inline volume control with a 3.5mm audio jack. It has a dial for adjusting the volume. The cable is black and neatly tied. It's useful for adjusting audio levels on the fly. Function: Remote level control for car subwoofers and amplifiers. Compatibility: Often universal, fitting many car amplifiers and powered subwoofer systems. Features: Typically features a rotary knob for volume adjustment and a 3.5mm jack plug. Installation: Can be mounted under the dash or elsewhere for easy access while driving. Not tested.