An elderly man was out in his garden talking to his next door neighbor over the garden fence.
“Hey Harry”, the man called over the fence, “I just bought a new hearing aid. It cost me just over four hundred dollars, but it’s truly state of the art. It’s perfect”.
“Really”, answered his neighbor, “What kind is it?”
The man answered, “Twelve thirty”.
Image used under a Collective Commons License from: https://commons.wikimedia.org/wiki/File:Traditional_BTE_hearing_aid.jpg