The MVR-75 is a rotary-type wall plate volume control for speaker systems with power ratings of up-Inch 75 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 Accepts speaker wire in sizes from 14 to 16 gauge