Volume Controller - TOOGOO(R) Car Home Audio Amplifier Bass RCA Gain Level Volume Control Knob LC-1 Black Color: Black; Condition: 100% Brand New and High Quality!!! Model: LC-1; Interface: 2*RCA Output, 2*RCA Input Total Length: 27.5cmApprox The distance between the mounting holes: 4.4cm(Approx) Quantity: 1 pc; Suitable for most of the car.