These accessories customize operation and assist with installation of lighting control systems. Companion switches pair with primary switches, dimmers, or fan speed controls to operate the controls from additional locations. Wireless remote controls allow operating wireless lighting and other devices from a distance. Power and relay control units adapt line-voltage signals to operate low-voltage sensors. Occupancy sensor photocells monitor indoor lighting levels and send signals to an occupancy sensor, which turns on or dims lights to meet user-selected settings. Mounting accessories support and secure lighting control system components.