The back of the Defcon badges
2 of 13 from Photos: Defcon badge inspires hacks
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The back of the Defcon badges includes a 3-volt battery, an RGB (red, green, blue) light-emitting diode(small beige square), a microphone (small gray square below that), and a digital signal processor surrounded by test points (far right). The "P" shaped section is a holding area where circuitry and other parts can be soldered on.
August 5, 2009 4:00 AM PDT
Photo by: James Martin/CNET
