Hello! While digging through my Dad's old stuff I found an odd little device. Amazingly, after who knows how many years, the battery still worked! Its some sort of tone-generator, and I'm curious about what the heck it'd be used for. The only markings on it say "Sanyo RC-555B", but that hasnt gotten me anywhere so far. Heres a picture and an mp3 of the sound it makes:
If it helps, my Dad worked in telecommunications. Thanks for any information!
Joe