3 Star Inc LVB45 Single Gang Low Voltage Mounting Box
This add-on Single Gang Box Can be attached to an existing single gang box and can be used for volume controls, switches or wall plates for Cable TV, Satellite TV, Telephone, LAN, and Speaker Systems. Great to use when adding equipment to existing structures.
Low Voltage Boxes
Electrical boxes designed for low-voltage use may be backless or in some way more open allowing easier access and wiring. Typical low-voltage signals include video, telephone, and network wiring. These boxes are not rated for High Voltage (Such as 115 VAC). They are typically categorized as "Old Work" or "New Work" boxes. Old Work would indicate use after the drywall has been installed and finished, New work would intonate that you are installing the box before the sheet rock or drywall has been placed, and you will be using the integral nails to affix to a wooden stud.