First of all I'm a newbee so please excuse my lack of knowledge. Using the Lutron Maestro Light Switch as the device in question, does detected movement need to be caused by a living / warm blooded thing? More precisely can motion detection be caused by a car entering a garage? This scenario would have whatever movement occur within the field of detection of the Lutron device and be within 30 feet or less. TIA for any help received. BobHelms