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Motion sensors track crowd density at Canal Park in Washington D.C. and glows brighter when more people are present.
Brian S31
Brian S31 May 06, 2013
Motion sensors track crowd density at Canal Park in Washington D.C. and glows brighter when more people are present.

I've seen these sensors...

Often 3
Occasionally 2
Rarely 2
Never 4
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Similar Photos: this is used by us in work frequently. very useful. measures distance accurately. Survey Optex Redwall Outdoor Detector

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