The hi-tech badges made for hackers
Hi-tech badges made by "hackers" for "hackers" were in great demand at the recent Def Con cyber-security conference.
Hardware experts spent months creating the unofficial electronic wearables, which came complete with a mini processor, hidden "Easter eggs", botnets and secret unlock codes to add features.
Owners could use their badges to hack similar devices around the conference for "lulz" - in other words to have fun at another's expense.
BBC Click’s Catharina Moh met up with AND!XOR whose badges caught the attention of Def Con founder "Dark Tangent".