Your training starts here. The Helio Core, powered by the BioTracker sensor, turns the Helio Strap into a pro-level performance tracker with real-time accuracy you can count on no subscription required.

• BioTracker technology for 24/7 monitoring of real-time heart rate, sleep, stress, and more
• Up to 10 days of battery life
• Free Zepp App for tracking nutrition, sleep, stress, and fitness progress

Note: The Helio Core accessory includes only the core itself, and does not include the middle frame, charging base, strap or arm bands.