The Sole of a Treasure Seeker

Treasure-Seekers3

The Treasure Seeker sandals are in fact – wait for it – a metal detector! They use beat frequency oscillation, meaning that the the ring creates a magnetic field; when a metal object is underfoot, it distorts the field and the battery pack alerts you to the presence of metal using a flashing red light and either a gentle vibration or a clearly audible buzz.

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[From http://www.bb-shopping.com/products/Treasure-Seekers-Metal-Detecting-Sandals.htm?id=&subid=&prodid=4903&curr=&m=1.00&cc=1%5D

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