Monoprice 108243 RMS 100W Speaker Volume Controller, White The MVR-100 is a rotary-type wall plate volume control for speaker systems with power ratings of up-Inch 100 watts per channel and impedance ratings of 4-Inch 16 ohms This rotary 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