This is a bit misleading. The chips can be as small as you want, but they need to be connected to an antenna, which is where the bulk of the tag footprint comes in. And there's no way these things can be read up to "100 metres away." Try three to four inches... Active RFID tags that contain a battery and act more like a beacon can be read at much greater distances, like 100 metres, but miniature passive tags like this really depend on the antenna size and being in a close proximity to an antenna/reader setup. Here it is:
http://news.bbc.co.uk/2/hi/technology/6389581.stm
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