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Bye bye chest strap. Meet Intel powered SMS BioSport headphones, the very latest in fitness monitoring tech.Get stoked about your next workout with BioSport. We’ve combined studio mastered sound with best-in-class fitness monitoring biometric technology. The results will keep your heart racing, and measure every beat.Heart Rate MonitorMerging premier sound quality with the latest in fitness-monitoring biometrics technology, the headphones include built-in optical sensor that continuosly measures your heart rate wile dynamically removing noise signals caused by your body's motion during your workout.Lose the Strap - Now you can track your heart rate while listening to yourfavorite tracks without an uncomfortable strap ormultiple devices.Throw out the Batteries - The 3.5 mm gold-plated audio jack delivers all the poweryou'll ever need for biometric monitoring. There isnothing to replace or recharge.Feel the Music - Professionally tuned 12mm drivers to deliver crisp vocals,tight bass and dynamic mid-tones. This is studio masteredsound on the go.Dive In - SMS Audio BioSport Earbuds are IPX4 rated forresistance to sweat and water.Track Results - SMS Audio BioSport Earbuds are compatible with majorfitness apps, so you can stay in shape and on track. Such as Run Keeper and many more.