Theater Solutions TSVCD White Wall Mount Impedance Matching Speaker Dial Volume Control Switch Theater Solutions TSVCD impedance matching matching 3 color dial speaker volume control, recommended power of 150 watts per channel Inputs and outputs accept up to 14 gauge wire, can be used with 4ohm, 8ohm, and 16ohm speakers, independent grounds for use with any amplifier Faceplates included, mounting depth is 3.25", fits most deep single gang electrical junction boxes Use for in wall or in ceiling home entertainment, home theater, multiple room system, industrial sound system This listing and price is for 1 volume control and full instructions