Check out this social network concept device with a difference. The ‘Handshake’ operates when the users are shaking hands and exchanges basic contact information between the users. The rings exchange and store the information automatically for you to browse through later via the card. The power need to operate the ring is generated from the users body temperature so no plu is required.
Source: http://www.gadgettastic.com/2008/01/18/handshake-ring-exchange-your-contact-details-via-a-handshake/
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