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SMS Audio Bio Sport Earbud with Heart Monitor, Black, Grey Feel the Music - Professionally tuned 12mm drivers deliver crisp vocals, tight bass, and dynamic mid-tones. This is studio mastered sound on the go. Lose the Strap - Now you can track your heart rate while listening to your favorite tracks without an uncomfortable strap or multiple devices. Dive In - SMS Audio BioSport Earbuds are IPX4 rated for-resistance to sweat and water. Throw out the Batteries - The 3.5 mm gold-plated audio jack delivers all the power you'll ever need for biometric monitoring. There is nothing to replace or recharge. Track Results - SMS Audio BioSport Earbuds are compatible with major fitness apps, so you can stay in shape and on track. Such as Run Keeper