A Passive Infrared Sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from human body in its ?eld of view. Built in light sensor adds intelligence to automatically detect day and night that removes 100% manual intervention to turn on?o? load. Delay setting is used to keep load active as per application. Day light and delay functionality gives maximum bene?t to user to save on energy and money. Within a year user can recover the cost of the device.