Leviton OSFHU-ITW Fixture-Mounted PIR High-Bay Sensor with 3 Interchangeable Lenses, White Passive Infrared Technology (PIR) Fast, simple installation Zero-crossing circuitry Green LED indicates occupancy detection Interchangeable lenses for 360 degrees high-bay, 360 degrees low-bay, and aisle way patterns Passive Infrared Technology (PIR) Fast, simple installation Zero-crossing circuitry Green LED indicates occupancy detection Interchangeable lenses for 360 degrees high-bay, 360 degrees low-bay, and aisle way patterns Operating frequency : 50/60 Hz