Where can I find an adaptor so that I can put 2 handsets on my landline phone?

I've searched the internet, but can't find what I'm looking for. I involve an adaptorso that I can listen in while a phone ring up is being made. I know they exist, but I don't know where on earth to find them!


Answers:    Wal-mart. Just by a splitter like you use to enjoy two phones coming out of one outlet and plug it in where on earth the phone cord plugs into the phone and then enjoy two head sets coming out of it.
Radioshack

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