LED lights and an electro-optical cell "sense" the volume of blood under the skin. From there, sophisticated algorithms are applied to the pulse signal so that the heart's true rhythm can be detected, even while running at performance speeds.
- Continuous heart rate monitoring offers a real time assessment of training intensity
- No uncomfortable chest strap - so you can train with heart and comfort
- Tested accurate at performance speeds
- Water resistant up to 30m depths
- Customize your workout with 3 user-settable heart rate zones
- Connect to your favorite fitness apps & devices with Bluetooth Smart (4.0)*
- Mineral glass display shows time, exact heart rate, & exercise timer, so you can have to-the-second visual data on everything you need to know