SMS Audio BioSport Earbud (Black/Gray) Biometric Earbud with heart rate monitor Professionally tuned 12mm drivers deliver tight bass and dynamic mid-tones. No need for uncomfortable straps or multiple devices. IPX4 rated for resistance to sweat and water. 3.5 mm gold-plated audio jack delivers all the power youll ever need for biometric monitoring. Nothing to replace or recharge. Intel Inside