Leviton OSC15-RIW PIR, 360 Degree, Commercial Grade 1500 Square Foot Coverage, Self-Adjusting, Ceiling Mount Occupancy Sensor, True White Self-Adjusting: Internal microprocessor continually analyzes, evaluates and adjusts the infrared sensitivity and time delay - performance is kept at a maximum and user complaints are eliminated Isolated Relay: Supports HVAC or other Class 2 low voltage signals - also supports both 24VAC/VDC power supplies Fast, Simple Installation: easy ceiling mount, twist lock sensor attachment for 360-Degree rotation and flexibility Additional mid-range lens assembly included for applications with mounting heights between 12'-20 Uses OSPxx series Power Pack: uses Class 2, 24 volt wiring, three wire connection (low voltage) - multiple sensors can control single or multiple power packs