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The experiment started on Monday, October 25, 2004 and lasted till Friday, November 5, 2004. Two different kinds of UHF tags were used: 950MHz passive tags attached to kids' school backs that are read at the gate of the school to activate a digital camera that takes pictures of kids and automatically send them via email to parents' mobile phones. 300MHz active tags are embedded in wrist bands that are worn by kids. When kids enter a potentially dangerous area, the system also sends picture messages to parents. 92% of the schools' 172 students participated in the experiment.
21.03.2005, 22:50
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