Electric switches and dimmers here are the low-voltage wall controls of installed AV: switches that raise and lower a projection screen, control interfaces that put screen, lift, and lighting behavior behind a labeled wall plate, and the dimming controls that set a presentation room's light level without leaving the lectern. They are the difference between a room that presents well and a room where someone stands on a chair.
Specify against the equipment controlled: screen and lift switches must match the motor and control system of the screen they drive - most are family-specific - and anything integrated into a room control system needs the interface the controller speaks. Placement is part of the design; the switch belongs where the presenter stands. Coordinate electrical rough-in early, since these controls are wall-plate devices installed with the room, not accessories added after. COLAMCO quotes AV control switches with the screens, lifts, and room systems they operate for business, government, and education facilities.