Most of us have all been in this situation. Heading out the door with the XYL (For those not into ham-speak that is your wife/girlfriend/partner) and you grab your radio, only to get "the look" or even worse, the "evil eye", and you place the radio back down and leave it at home.
You ponder next time sneaking it into your jacket pocket, but thats not going to work as she will see it when you pull it out to key up the repeater. You could clip it onto your belt, but she will notice it there too.
What if the radio was so small it would fit into the palm of your hand, or even in your shirt pocket! What if the radio was so small it was an extension of your keyring, a ham radio key fob!
Thats it! A ham radio key chain. She will never notice it, and if she does, she won't believe its a real radio, its way to small for that.
Thats exactly what you're looking for. A radio so small that it can be used as a keychain! Yet fully functional allowing use of ordinary UHF repeaters.