At Defcon 2008, Joe Grand overviews his hackable badge that features the Freescale Flexis MC9S08JM60.

When it comes to convention badges, Defcon certainly takes first place. This year’s badge is practically studded with blinking LED lights, batteries and even an SD card reader. As always, attendees are encouraged to hack the badge and the best contraption will win prizes.

Over the last two years, Defcon — the world's largest hacker conference — has handed out hackable convention badges, which attendees are encouraged to hack as quickly and uniquely as possible.

Wired got a sneak peek at one of the more fun aspects of this coming weekend's Defcon, the hackable badge. Last year's badge was hacked in just ten minutes, but it didn't have an SD card slot and USB support. The new card has fewer features than last year's but is more powerful.

Defcon will once again be one-upping the sophistication of the conference attendee badges.