Yellow Walkie-Talkies?

What were the yellow walkie-talkies they had in GB2?

FYI Those are not walkie talkies they are Lifegards. Man down devices used by firefighters and rescue personel. They emit a high pitched warning sound when the wearer becomes incapacitated so that other rescuers can find them. I think they just put them in the movie for the look or in the case like where venkman got slimed in GB1, Ray could have located him :lol:

I always wondered what those things were.

Thanks!!!

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They show up on Ebay from time to time for 5 - 20 bucks, from what I understand.