




Amazfit Helio Strap
Choose options
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BioCharge™ energy monitoring to support recovery and peak performance
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24/7 Health Monitoring for real-time heart rate, sleep, stress, and more
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27 workout modes including smart strength training and official HYROX Race mode
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Free Zepp App for tracking nutrition, sleep, stress and fitness progress
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Up to 10 days of battery life
【Model】A2445
【Warranty】1 Year
【Designs】
Colors: Black
Dimensions (without heart rate base): 33.97 x
24.3 x 10.59mm
Weight: 20g
Body Material: Fiber-reinforced polymer
Water-resistance Grade⁵: 5
ATM
【Battery】
Battery Capacity: 232 mAh (rated value)
Typical Use Battery Life: Up to 10 days
【Sensors】
Health: BioTracker™ 6.0 PPG biometric sensor
(5PD + 2LED)
Movement: Acceleration, Gyroscope,
Temperature
Connection: Bluetooth 5.2, BLE
【Other】
Motor: Rotor motor
【Strap】
Materials: Nylon
Width: 22mm
Min. & Max. Wrist Dimensions: 145-205mm
Buckle: Hook & loop fastening
Packing list: Smart band & strap
(assembled) magnetic charging head (no cable), instruction manual
Packaging Materials: Made with 100% recyclable
materials⁶
Supported Devices: Android 7.0 and above, iOS
15.0 and above
Application: Zepp App
Recovery Redesigned
Unlike competitors that rely on a single
device, the Amazfit Ecosystem offers a fully integrated training system that
seamlessly connects your smartwatch, like the Balance 2, with the Helio Strap
and other devices through the Zepp App. This ensures uninterrupted data collection whether you're training, sleeping, or resting - even when your watch is off.
By eliminating data gaps and extending
battery life, the system delivers accurate heart rate monitoring, fatigue assessment, and recovery analysis. With real-time insights and AI-powered recommendations, it empowers you to train smarter, recover better, and repeat
every day.
BioCharge™ Energy Monitoring
BioCharge™ helps you understand your energy levels throughout the day. From the moment you wake up after a night of rest,
your BioCharge™ score will adapt based on your daily workouts, activities,
stress levels, and rest periods.
24/7 Health Monitoring
Fine tune your fitness with real time
insights into heart rate variability, sleep1,
blood oxygen levels, stress, exertion, fitness level, and more, powered by
Amazfit’s advanced BioTracker™ technology²

Strength Training & HYROX Modes
Stay on top of your training with detailed
tracking for reps, sets, and rest periods. Train smarter with exclusive HYROX
Race and PFT modes, which offer race-specific and fitness benchmark training
tools.

Your Workouts, Your Way
Unlock your full training potential with 27
built-in sports modes available through the Zepp App. Each mode is tailored to
capture key performance metrics and optimize your workouts.

Post-Workout Analysis
Eliminate guesswork and train with
precision using advanced performance metrics including VO2 max,training load, training effect, and recovery time. Get a clear picture of how hard you're working.

ZeppApp, Powering Amazfit
Your free companion for tracking nutrition
and fitness, optimizing sleep and recovery, analyzing health trends, and
gaining personalized insights - all in one easy to use app.
Seamless Integration with Third-Party Platforms
Sync your training data from the Zepp App to leading platforms³ like Strava, TrainingPeaks, adidas Running and komoot, to consolidate your fitness data and keep your routine fluid across multiple tools.
ChargeLess, Move More
Train, recover, and repeat without missing a beat. The Helio Strap can last up to 10 days from a single charge⁴.
【Sports& Health Features】
Sports Features
Sports Modes: 27
Smart Recognition of: 25 strength
training movements⁷
Connection to Peripheral
Workout Devices⁸: Watches,
stopwatches, treadmills
Workout Status: PeakBeats™
Sync to 3rd Party Fitness
Apps: Strava,
adidas Running, TrainingPeaks (via Terra), komoot, Relive, Google Fit,
Apple Health
Health
Features
Energy Levels: BioCharge™
24H Monitoring: Heart rate,
Blood-oxygen saturation, Stress level
Sleep Quality
Monitoring: Sleep
heart rate variability, Sleep stages (including REM), Daytime naps, Sleep
schedule, Sleep breathing quality, Sleep score
Other Health Features: PAI health assessment
system, Heart rate recovery
Running &walking:
Outdoor running, Treadmill, Walking
Cycling:
Outdoor cycling, Indoor cycling
HYROX:
HYROX race
Indoor workouts:
Strength training, Elliptical, Stair-climbing machine, Stair stepper,
Spinning, Mixed aerobics, Cross-training, Aerobics, Group calisthenics,
Body combat, Step training, Flexibility training, Free training, HIIT,
Yoga, Pilates, Gymnastics, Horizontal bar, Parallel bars, Battling ropes,
1. Sleep monitoring can record night sleep and naps that last more than 20 minutes. Sleep Breathing Quality tracking needs to be enabled in the Zepp App or in the settings of the watch's Sleep feature.
2. This product and the Zepp App are not medical devices and cannot be used for medical purposes, or as basis for diagnosis of any medical condition. Detection results are provided for reference only. Please consult professional medical institutions if you feel unwell. 24-hour monitoring of heart rate and blood-oxygen saturation (SpO₂) need to be enabled in the Zepp App. Abnormal heart rate alerts and the preset value need to be set in the Zepp App. To measure blood-oxygen saturation (SpO₂), please wear the watch tightly at one finger-width from the wrist, and keep your arm still for best results. SpO₂alerts are sent if the detected rate is too low compared to the preset value, which needs to be set in the Zepp App, at a minimum of 80%. Movement, and environmental and physical characteristics can affect speed and accuracy of monitoring and measurement. The 24-hour stress level monitoring needs to be enabled on the watch or in the Zepp App. Alerts for high stress levels are based on the preset value, and prompts for the breathing exercise need to be enabled on the watch. Smart health alerts need to be enabled in the watch settings or Zepp App. To process the one-tap measurement and other manual metric measurements, please wear the watch tightly at one finger-width from the wrist, and keep your arm still for best results. Movement, and environmental and physical characteristics can affect speed and accuracy of monitoring and measurement.
3. Fitness app availability may vary depending on your country or region. Apple Health is only available on iOS devices, and Google Fit is only available on Android devices.
4. The battery life may vary according to the settings, operation conditions and other factors. So the actual result may differ from the laboratory data. Typical usage scenario: Wear all day; heart rate monitoring and blood-oxygen detection is always on and measures continuously; sleep monitoring and auxiliary are enabled with 8 hours of sleep breathing quality monitoring; stress monitoring is enabled; exercise three times a week while linked to your smartphone's GPS for 60 minutes each time.
5. According to the ISO 22810:2010 standard, the Amazfit Helio Strap achieves a rating of 5 ATM, for a water-resistance of up to 50 meters, and is therefore suitable for splashes, snow, showering, swimming. It has passed third-party testing conducted by SGS, and the report number is SHES250300449771. Remove the strap when taking a hot shower or trip to the sauna, since too much steam can affect the seal and make it less water-resistant in future. For more information, please visit the support page at: support.amazfit.com.
6. The material used for the packaging box is 100% recyclable, with naturally degradable materials including mineral-free inks and anodized aluminum used in the bronzing process.
7. Smart recognition of strength training exercises can only be engaged within the Strength Training sports mode. 25 exercises are able to be recognized at time of product release, including: Bodyweight squats, Bodyweight straight arm front squats, Barbell squats, Tricep pushdowns, Bent over rows, Barbell bench press, Sit-up holds, Knee-touch sit-ups, Dumbbell flys, Burpees, Burpee jumps, Overhead tricep extensions, Lying tricep extensions, Lateral raises, Jumping jacks, Lat pulldowns, Deadlift, Push-up, Shoulder press, Pull up, Bicep curls, Seated cable rows, Dumbbell drag curls, Straight-arm pulldowns, Russian twists. If an exercise is not auto-recognized by watch, the Zepp App can provide a list of muscle groups or exercise names to choose from. Training templates and interval training templates are compatible with: Strength training, Outdoor running, Treadmill, Outdoor cycling, Indoor cycling, Rope skipping, Rowing machine, Indoor fitness, Core training, and Stair climbing.
8. Connection to peripheral Bluetooth devices only supports devices with BLE connection.
The product images and screen content shown
above are for reference purpose only. The actual product (including but not
limited to its appearance, color and size) and screen display content
(including but not limited to the background, UI and graphics) may differ
slightly.
The data that is provided on this page
without a specified source is taken from internal laboratories or supplier
data, and has been obtained under a specific test environment. The product's
actual performance may differ slightly due to product individual differences,
software versions, usage conditions and environmental factors.
To provide product information,
specifications and characteristics as accurately as possible, our company may
adjust and revise the text descriptions, images and other content in the above
pages at any time. Due to real-time changes in product batches and
production-supply factors, we may modify the above information as required
without providing a special notice.
The radio waves generated by the equipment
may affect the normal operation of implanted medical equipment or personal
medical equipment, such as pacemakers and hearing aids. If you use these
devices, please consult their manufacturers for restrictions on using this
device.
The product should not be worn in
environments with strong magnetic fields such as MRI machines or medical
imaging machines, as they may cause damage to the watch.