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The Mirror 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, mirrors, glass, etc. This allows you to switch on and off the light more freely by hand wave. With 05100.02, it is ideally to be applied by the side of mirror or exposed outside the furniture. The advantage of using high-voltage sensor switches is that it allows you to turn off the power completely.
link:http://www.hkram.com/sensor-switch/ir-sensor-switch/mirror-sensor-switch.html
Mirror Sensor Switch