To UNTengineer: Could be, but all the info I have seen says it's 13.56. Like I said, it was just curiosity.
To Grumpy_Mike: USA and they are fairly common here. Many retail stores have a blink terminal. I believe they are good for under $25 purchases. I never use them, but some of my cards have the chip. There was a report on TV some weeks ago about how some guy bought a reader on ebay (about $70) hooked it up to his laptop and was getting credit card info. In fact, with the owner's permission, he used the info obtained from bumping (to get closer enough to read the card in his pocket) his target to clone a card onto a hotel room keycard and then used the card to charge several hundred dollars from retail stores. No one even questioned that it was a room key. Scary!