SMS Audio BioSport Earbud (Blue) Every nuance and note of your music pours from the SMS BioSport Earbuds delivering studio mastered sound on the go. Professionally tuned 12mm drivers to deliver crisp vocals, tight bass and dynamic midtones. There's no need to go for your run with what feels like a strap on every extremity to track your fitness progress. Now you can track your heart rate while listening to your favorite tracks without carrying multiple devices. The 3.5 mm goldplated audio jack delivers all the power you'll ever need for biometric monitoring. You just need the BioSport&trade blue Earbuds, your favorite mobile device and fitness app to set out on your fitness goals. SMS Audio BioSport Earbuds are made for your most strenuous workout without breaking from sweat. IPX4 rated for resistance to sweat and water, even your run in the middle of a downpour is their natural territory. SMS Audio BioSport Earbuds in blue track your heart rate without the need for an additional battery to charge or add extra weight to the superlight headphones. The running earbuds are compatible with most major fitness apps, so you can stay in shape and on track.