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JohnHelm
on Jan 4, 2014
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Durr: A shivering unisex bracelet that investigate...
Get a GymBoss interval timer. Great for exercise, and can accomplish this perception thing. (it has a vibrate-only mode).
http://www.amazon.com/Gymboss-Interval-Timer-Stopwatch-METAL...
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Search:
http://www.amazon.com/Gymboss-Interval-Timer-Stopwatch-METAL...