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These swimming goggles have a system which projects the number of laps swum, speed, and the elapsed time right in the goggle lens! This lets swimmers maintain their form instead of straining to glance at pace clocks or watches. This is such a cool idea and if you are an avid swimmer would really make your sport much more efficient to where you wouldn`t have to worry about that and can focus on your form and speed.
Image Source: http://www.engadget.com/2005/06/24/swim-goggles-with-heads-up-display/