This RFID is embedded in a wristband. It is used to make calls on a nearby phone. There are already rfid tags in many things, from labels on clothing in shops to mobile phones and travelcards. At present most uses are benign, as far as we know, but it is possible that in future every thing will be tagged with these devices, so there will exist a complete "INTERNET OF THINGS", which could lead to abuse of privacy etc. Some are already implanted into people. It helps them to find their keys etc, if they have failing memory. At present the signals from the devices can easily be blocked by a thin layer of aluminium and much other material, which is a disadvantage for their useful functioning. In future they may become so small they are indetectable, except by those who know where they are, and they may avoid being blocked.
There are some more images of rfid tags and their uses in the link "Claire's photos".
The green cartoon guy below has been well and truly tagged.
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