Leviton OSFHD-ITW Dual Relays, Interchangeable Adjustable Lenses, Bright Green LED, 120V/230V/277V/347V, Passive Infrared Occupancy Sensor, White Quick snap feature for easy installation Interchangeable 360-Degree high bay, low bay and aisle lens included Integrated rotating adjustable light sensor and 24 hour auto-calibration for "set-it and forget-it" LED indicator light blinks when sensor detects motion, visible from long distance (40 feet) Non-volatile memory, device returns to its last state during power interruption