A ridiculously impressive project hit Kickstarter last week called Dash. Not only are these earbuds truly wireless, but they also track your fitness with a tiny infrared LED, including motion, heart rate, and body temperature. One headphone talks to the other over Bluetooth, then the second talks to your iPhone over Bluetooth, though the headphones can play audio independently thanks to 4 GB of included storage. A capacitive touch sensor on the outside of each earbud lets you control audio, take calls, and adjust tracking.
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