Auto-ON PIR Motion Sensor Light Switch : This PIR motion sensor is a versatile and compact tool for automation and security applications. It detects movement using changes in movement of outside body heat profiles. With an adjustable OFF timing and range of up to 8 meters, this sensor can trigger connected lights, alarms or other devices when movement is detected within its viewing angle. Its compact size and simple installation make it suitable for use both indoors and outdoors. Reliable detection and low power consumption allows it to run off batteries for extended periods. It has adjustable setting for OFF timing and Day/Night detection setting.