| Type | Screenless wearable training system (arm-worn heart-rate sensor plus waist-worn motion sensor), no display | — |
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| Sensors | Helio Core Motion HR: BioTracker 6.0 PPG optical heart-rate sensor (5PD + 2LED), accelerometer, gyroscope, temperature sensor, geomagnetic sensor. Helio Core Motion Waist: accelerometer, gyroscope, geomagnetic sensor | Polar Precision Prime optical heart-rate sensor (OHR Gen 3.5), accelerometer; no skin temperature sensing |
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| Battery | Up to 11 days typical (Helio Core Motion HR), up to 40 days typical (Helio Core Motion Waist), 232 mAh cells, magnetic charger | Up to 8 days, 170 mAh Li-Pol, USB-C charging cable |
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| Water Resistance | 5 ATM | — |
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| Connectivity | Bluetooth 5.2 (BLE) | Bluetooth Low Energy (one connection, reserved for Polar Flow); no built-in GPS (uses phone GPS in Polar Flow) |
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| Weight | 11.4 g (Helio Core Motion HR), 10.7 g (Helio Core Motion Waist) | — |
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| Sports Modes | More than 50 sports modes via the Zepp App, HYROX Race and Simulation support | — |
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| Compatibility | Android 8.0 and above, iOS 17.0 and above via the Zepp App; HYROX modes require Amazfit Balance 3 or Balance Ultra at launch | — |
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| In the Box | Helio Core Motion HR, Helio Core Motion Waist, Helio Pro Clip, wristband, armband, magnetic charging head | — |
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| Subscription | No monthly subscription required | — |
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| Display | — | None - screen-free band with no buttons; data is shown in the Polar Flow app |
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| Body | — | Stainless steel sensor unit, 42 x 27 x 9 mm; 29 g with band (19.5 g without band); SoftWeave band in S/M and M/L sizes; WR30 water resistance |
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| Tracking | — | 24/7 heart rate, activity, sleep and recovery tracking; Nightly Recharge, SleepWise, Sleep Plus Stages, Training Load Pro, automatic training detection |
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| Memory | — | 4 weeks of data on the band (16 MB storage) |
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| Software | — | Polar Flow app (free, no subscription); one-time purchase |
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| Colors | — | Greige Sand, Night Black, Brown Copper; extra bands USD 29.90 |
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