Product review (1 stars): Item received does not match the picture.
The Emitter board I received is not as pictured. The one shown has a metal tube around the LED on the Emitter board to protect from external light or to narrow the light beam;  I'm not sure which. The metal tube is missing on the Emitter board. It does not work in my Whirlpool refrigerator, The red light on the Optics Receiver board does not ever stay on; However it does flash at times but not the 2 flashes followed by 1 second off and repeat the cycle as it should; It simply flashes but only when with the freezer door being closed is simulated by holding the door interlock switch pressed.