| Type | Screenless fitness, sleep and recovery tracker worn on the upper arm or wrist, no display | — |
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| Display | None (screenless, all data is read in the Zepp App) | None - screen-free band with no buttons; data is shown in the Polar Flow app |
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| Sensors | BioTracker 6.0 PPG optical heart-rate sensor (5PD + 2LED), accelerometer, gyroscope, temperature sensor | Polar Precision Prime optical heart-rate sensor (OHR Gen 3.5), accelerometer; no skin temperature sensing |
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| Battery | Up to 10 days typical use, 232 mAh (rated), magnetic charging head | 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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| Dimensions | 33.97 x 24.3 x 10.59 mm (without sensor) | — |
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| Weight | 20 g | — |
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| Body Material | Fiber-reinforced polymer | — |
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| Strap | 22 mm nylon strap with hook-and-loop fastening, fits 145-205 mm | — |
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| Sports Modes | 50+ sports modes via the Zepp App, 25 recognised strength movements, HYROX race mode | — |
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| Health Tracking | Continuous heart rate (per second), blood-oxygen, stress, sleep stages including REM, naps, sleep breathing quality, sleep score, BioCharge energy score, PAI, heart-rate recovery | — |
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| Heart-Rate Broadcast | Real-time heart rate over Bluetooth to compatible watches, bike computers, gym equipment and apps; offline heart-rate storage up to 21 days | — |
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| Compatibility | Android 7.0 and above, iOS 15.0 and above, via the Zepp App | — |
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| In the Box | Helio Strap with assembled strap, magnetic charging head (no cable), instruction manual | — |
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| Subscription | No required monthly subscription | — |
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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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