WHOOP 4.0 Sensor vs Amazfit Balance 2
Compare specifications, current prices and availability. Choose up to four products from the same family.
 Amazfit Balance 2 Original price was: KSh 42,000.00.KSh 39,000.00Current price is: KSh 39,000.00.Buy now |
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At a glance
Key specifications and important differences. Full details follow below.
| Feature |  WHOOP 4.0 Sensor | Amazfit Balance 2 |
|---|---|---|
| Price | KSh 36,000.00 | Original price was: KSh 42,000.00.KSh 39,000.00Current price is: KSh 39,000.00. |
| Display | — | 1.5-inch AMOLED touchscreen |
| Battery capacity | — | 658 mAh rated |
| Water resistance | IP68; water-resistant up to 10 m for 2 hours; swimming and showering supported, not diving | 10 ATM; suitable for swimming and supported diving activities subject to manufacturer guidance |
| Storage | — | 32GB |
| Operating system | — | Zepp OS 6 |
| Network / cellular | — | No |
| Positioning / GNSS | — | Dual-band, six-satellite positioning with circularly polarized GPS antenna |
| Health & wellness features | Continuous heart rate, HRV, respiratory rate, skin-temperature variation, strain and recovery tracking; not a medical device | 24/7 heart rate, blood oxygen, stress, HRV, BioCharge, LifeLoad, training load and recovery insights; wellness measurements are not intended for medical diagnosis |
Full specifications
2 of 4 products
| Specification | WHOOP 4.0 Sensor | Amazfit Balance 2 |
|---|---|---|
| Identity & design | ||
| Brand | WHOOP | Amazfit |
| Model | WHOOP 4.0 sensor | Balance 2 |
| Announced | — | June 24, 2025 |
| Dimensions | — | 47.4 × 47.4 × 12.3 mm (heart-rate sensor base excluded) |
| Weight | — | 43 g without strap |
| Build materials | Screen-free continuous-wear sensor housing | Aluminum-alloy frame, fiber-reinforced polymer case and sapphire-glass touchscreen |
| Wrist size | — | 140–210 mm |
| Strap / band | — | 22 mm silicone strap with classic pin buckle; additional Lava strap included with applicable package |
| Controls / buttons | — | Two physical buttons and touchscreen |
| Display | ||
| Display | — | 1.5-inch AMOLED touchscreen |
| Screen resolution | — | 480 × 480 pixels, 323 ppi |
| Display protection | — | Sapphire glass |
| Performance & software | ||
| Storage | — | 32GB |
| Operating system | — | Zepp OS 6 |
| Connectivity | ||
| Network / cellular | — | No |
| SIM / eSIM | — | No |
| Wi-Fi | — | 2.4 GHz Wi-Fi |
| Bluetooth | — | Bluetooth 5.2 BLE |
| NFC | — | Yes |
| Positioning / GNSS | — | Dual-band, six-satellite positioning with circularly polarized GPS antenna |
| Ultra Wideband (UWB) | — | No |
| Satellite features | — | No |
| Audio & communication | ||
| Speaker | — | Two built-in speakers |
| Microphone | — | Built-in microphone |
| Calling | — | Bluetooth phone calls when paired with a compatible phone |
| Sensors, health & fitness | ||
| Sensors | Photoplethysmography sensors and skin-temperature sensing | BioTracker 6.0 PPG biometric sensor (5PD + 2LED), accelerometer, gyroscope, barometric altimeter, ambient-light sensor, geomagnetic sensor and temperature sensor |
| Health & wellness features | Continuous heart rate, HRV, respiratory rate, skin-temperature variation, strain and recovery tracking; not a medical device | 24/7 heart rate, blood oxygen, stress, HRV, BioCharge, LifeLoad, training load and recovery insights; wellness measurements are not intended for medical diagnosis |
| Sleep tracking | Automatic sleep detection, sleep duration, stages, sleep need and sleep performance | Sleep stages, naps, sleep score, sleep HRV and recovery insights |
| Sports / workout modes | Automatic and manual activity tracking | More than 170 sports modes with strength training and official HYROX modes |
| Training & outdoor features | — | Zepp Coach, downloadable base, ski and golf-course maps, turn-by-turn navigation, route tools and support for compatible workout peripherals |
| Diving / depth features | — | Scuba-diving support; follow the manufacturer’s dive-mode limits and safety guidance |
| Battery & durability | ||
| Battery capacity | — | 658 mAh rated |
| Battery life | Approximately 5 days | Up to 21 days typical use, 10 days heavy use, 33 hours accurate GPS or 67 hours power-saving GPS |
| Charging | WHOOP 4.0 slide-on wireless Battery Pack for on-wrist charging | Magnetic charging head; approximately 2 hours; USB-C cable is not included |
| Water resistance | IP68; water-resistant up to 10 m for 2 hours; swimming and showering supported, not diving | 10 ATM; suitable for swimming and supported diving activities subject to manufacturer guidance |
| Durability / certifications | — | MIL-STD-810G-2014 low-pressure, temperature, shock, vibration and impact tests; TUV water-resistance report 68.189.25.0132.01 |
| Compatibility | ||
| Phone compatibility | Compatible iPhone or Android phone; current support recommends iOS 18+ or Android 10+ | Android 7.0 or later; iOS 15.0 or later |
| Companion app | WHOOP app | Zepp app |
| Colors | — | Black with additional Lava strap |
| Additional specifications | ||
| Charging time | Approximately 150 minutes for the sensor; around 2 hours for the Battery Pack | — |
| Movement sensors | Accelerometer | — |
| Bluetooth and Wi-Fi | Bluetooth 4.2 or higher | — |
| Packing list | WHOOP 4.0 sensor, compatible band and WHOOP 4.0 Battery Pack | — |
| Smart recognition | Automatically recognizes 45 activity types | — |
| Energy, load and readiness features | Recovery, Strain and Sleep scores with personalized coaching | — |
| strap material | SuperKnit performance band | — |
| armband | WHOOP 4.0 band; not compatible with WHOOP 5.0 or MG | — |
| heart rate broadcast | Real-time heart-rate broadcast supported | — |
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