We've got smartphones and smart watches — so why not smart headphones? Dash Smart Earphones are indeed smarter than your standard pack-ins, and almost all aftermarket cans, as well. Thanks to a host of sensors, they can track your pace, steps, cadence, distance, heart rate, oxygen saturation, and energy spent, relaying the information back to your devices via Bluetooth. They use the same connection to act as wireless headphones, and thanks to a built-in ear bone microphone, can serve as a headset, as well. Forget your phone at home? Not to worry, as they also feature 4GB of storage and a built-in music player, so you're never without your tunes.