Click image to view full size image
The 12V IR sensor switch is workable with or without obstacle by choice from two different detectors. With 05100.01, the Sensor can be installed behind nonmetallic transparent material, i.e. mirrors, glass, etc
link:http://www.hkram.com/sensor-switch/ir-sensor-switch/12v-ir-sensor-switch.html
IR sensor for cabinet light