Quoth Nunavut Pants
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It wasn't just phone ringers which would set them off; jingling keys, dog collar tags, pretty much anything involving pieces of metal banging together. Of course, it was still better than its predecessor, "Flash-Matic", which used a series of photo-sensors activated using a glorified flashlight like this one:
While it technically worked, users tended to forget which sensor controlled which function, and if the set happened to be bathed in sunlight or other bright light, all four sensors would be operated at once multiple times over.........
-Adam
Arcane tech historian
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