Monoprice 108244 RMS 50W Speaker Volume Controller, White The MVL-50 is a slider-type wall plate volume control for speaker systems with power ratings of up-Inch 50 watts per channel and impedance ratings of 4-Inch 16 ohms This slider control can be set-Inch one of twelve positions including the minimum (off) and maximum volume settings Please note: This volume control does not include a wall mounting bracket