The MicroSD Card Reader Watch is compatible with Windos 98, 2000, XP, Vista, Windows 7 and Mac OS X 9.1 and above, if you want one they are available for $15.99 from Think Geek.
The MicroSD Card Reader Watch features a built in microSD card reader that you can hook up to your computer with a USB cable to read microSD cards.
It also features a stainless steel bezel, and a rubber watch band, the watch is water resistant and shock proof, and it features a three year battery life.