The New and Improved Versonel Nightwatcher Pro VSLNWP502 Security Light is a proven and effective method of deterring intruders from entering your home or business. The light has a patented motion tracking feature, built into a PIR lamp (Passive Infrared Sensor). The intelligent motion/heat activated sensor tracking light on the Versonel Nightwatcher Pro VSLNWP502 detects motion within the 220? field of vision of the PIR and turns the lamp to point directly at the intruder. It is designed to illuminate when the detection area is entered by a person and will detect a moving heat source. As the intruder moves across the viewing range, the motorized lamp head with 8 x 1W Nichia 120lm LED bulbs takes aim and follows, giving the appearance that they are being watched. Covered under a 1 year warranty.