Cost Less Lighting offers several different types of motion sensors.
Vacancy sensors are used to detect when an area is vacant so that it can shut down the lighting fixture.
Occupancy sensors are used to detect when an area is occupied. This allows for the lighting fixture to remain off until someone enters the area, turning the light on.
High bay occupancy sensors do the same thing but are specifically for high mounted areas like warehouses, barns, and arenas. Each of these motion sensors save energy and money.