The present invention provides a 
system comprising an 
occupancy sensor for sensing occupancy of an area, able to activate upon sensing occupancy of the area, maintain activation when sensing continuing occupancy, to include settings therefor, and to enable self-adjusting of the settings. It includes an 
infrared sensor section, able to passively sense occupancy and activate a 
signal, continue to activate upon sensing continuing occupancy, and enable separate 
processing of the settings. It also includes an 
ultrasonic sensor section, able to actively sense occupancy, activate a 
signal upon sensing continuing occupancy, and enable separate 
processing of the settings. The 
occupancy sensor is able to activate when the 
infrared sensor section senses occupancy, and to maintain activation when either the 
infrared sensor section or the 
ultrasonic sensor section senses continuing occupancy of the area. The infrared sensor section signals and the 
ultrasonic sensor section signals are each independently formed and activated.