I recently installed the KS200 motion sensor switch and cannot get the motion sensor to function properly.  When I set motion sensitivity to mid range the device will not pick up any motion at all.  When I set motion sensitivity to far range the device triggers constantly and imediately after manual buffer setting with no motion.  I have turned the ambient sensor off for the time being.  This switch is installed in my garage right near the door to the house and I would expect it to trigger upon entering the garage from the house and when driving into the garage.