CHELINK Dash mount amplifier level control for volume adjustment, used to adjust an amplifier's power level, stereo, equalizer or crossover volume form the dashboard.

Specification:
Frequency:150Hz - 40Hz
Gain: 0dB - 12dB
Interface: 4 Gold plated (2*RCA input+2*RCA output)
Size: 2.6*3.1*1.4 inch

Feature:
It adds sub-woofer level controls or balances a multiple amplifier installation;
Fine tunes the volume of any RCA line level signal you wish to control;
Compatible with most head units/amplifiers combinations;
Compact housing allows the unit to be mounted virtually anywhere so control is at the user's fingertips;
In-dash or Under-dash mountable, can adjust the amplifier gain even while driving;
Simple in and out connections, no additional wiring needed;
Great for a sub amp volume control.