Meet Marlin: a smart wearable device that gives swimmers feedback on distance, speed, lap time, and navigation information. It uses bone conduction technology to help you hear as you swim in the pool or open waters.
Marlin relies on GPS to track your performance outside. It also has motion sensors. The device is waterproof to 1.5 meters for 30 minutes. It has Bluetooth connectivity. More info is available here.
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