Wall Mount Volume Control Knob - Flush In-Wall Plate Rotary Style Adjustment 20 &ndash; 20kHz Frequency Response Companion for Hi-Fi Four-Pair Speaker Selector w/ Audio & Video Compatibility - Pyle PVC1 ROTARY KNOB ADJUSTMENT: A multi-position light-touch rotary knob style adjustment for whole house audio source volume systems. You can control speaker volume independently within various areas of your home, office or business applications FOUR-PAIR SPEAKER SELECTOR: Add up to 4 pair of speakers throughout your house and control them all from this wall plate volume control. It maintains the full hi-fi audio frequency response with no low frequency roll-off 20Hz  20kHz FREQUENCY RESPONSE: Pyle wall mount volume control your speakers to deliver a rich quality sound in the same room as your speakers. This in-wall volume control is designed for wide frequency response range reproducing high-fidelity sound IN-WALL/WALL PLATE: This whole-house volume control is a universal standard decorative flush in-wall or wall mount installation finishing plate for speaker and stereo system control. It includes mounting ring and other installation wire nuts 100w POWER HANDLING: Pyle flush in-wall volume control works with all audio and video systems up to 100w power. A convenient audio source volume setting that allows you to control speaker volume independently in each audio zone