Here is a pair of smart goggles that can help you improve as a swimmer. The Zwim is a Google Glass like device with a HUD that shows your lap time, heart rate, and other relevant info. It syncs to your smartphone, so you can make sense of the data.
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The Zwim uses an optical heart rate sensor to monitor your performance. It is waterproof to 30 meters. The battery life lasts 4 hours.
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