SMS Bio Sport Earbud - Black/Grey.
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 you'll ever need for biometric monitoring. Nothing to replace or recharge.