RAB Lighting STL200W/240 is a sensor that can be used to automatically turn on lights when it detects movement. It has a 200° detection pattern and can detect movement up to 40 feet away. It can be used to control up to 1000 watts of incandescent or quartz lighting or 500 watts of fluorescent lighting. It has a built-in photocell that allows it to automatically turn on the lights at dusk and turn them off at dawn. It also has a manual override mode that allows you to keep the lights on even when there is no movement.