Amazfit T-Rex 3 vs WHOOP 4.0 Sensor
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Apple Watch SE 2 Price range: KSh 28,500.00 through KSh 32,000.00
AmazFit Balance Original price was: KSh 26,500.00.KSh 22,000.00Current price is: KSh 22,000.00.
AmazFit Falcon Original price was: KSh 70,000.00.KSh 63,000.00Current price is: KSh 63,000.00.
AmazFit Cheetah Original price was: KSh 35,000.00.KSh 28,000.00Current price is: KSh 28,000.00.
At a glance
Key specifications and important differences. Full details follow below.
| Feature |  Amazfit T-Rex 3 |  WHOOP 4.0 Sensor |
|---|---|---|
| Price | KSh 33,000.00 | KSh 36,000.00 |
| Display | 1.5-inch AMOLED touchscreen | — |
| Battery capacity | 700 mAh rated | Internal rechargeable battery; capacity not published |
| Water resistance | 10 ATM; suitable for swimming and supported high-speed water sports subject to manufacturer guidance | IP68; water-resistant up to 10 m for 2 hours; swimming and showering supported, not diving |
| Positioning / GNSS | Dual-band, six-satellite positioning | — |
| Health & wellness features | Heart rate, blood oxygen, stress, PAI and temperature insights; wellness measurements are not intended for medical diagnosis | Continuous heart rate, HRV, respiratory rate, skin-temperature variation, strain and recovery tracking; not a medical device |
Full specifications
2 of 4 products
| Specification | Amazfit T-Rex 3 | WHOOP 4.0 Sensor |
|---|---|---|
| Identity & design | ||
| Brand | Amazfit | WHOOP |
| Model | T-Rex 3 | WHOOP 4.0 sensor |
| Dimensions | 48.5 × 48.5 × 13.75 mm (heart-rate sensor base excluded) | Exact dimensions not published in current WHOOP support documentation |
| Weight | 68.3 g without strap | Exact weight not published in current WHOOP support documentation |
| Build materials | Stainless-steel bezel, polymer middle frame and Gorilla Glass touchscreen | Screen-free continuous-wear sensor housing |
| Wrist size | 145–210 mm | — |
| Strap / band | 22 mm liquid-silicone strap with classic pin buckle | — |
| Controls / buttons | Four physical buttons and touchscreen | — |
| Display | ||
| Display | 1.5-inch AMOLED touchscreen | — |
| Screen resolution | 480 × 480 pixels, 322 ppi | — |
| Display protection | Gorilla Glass | — |
| Display features | Up to 2,000 nits peak brightness; always-on display and more than 400 watch faces | — |
| Connectivity | ||
| Wi-Fi | 2.4 GHz Wi-Fi | — |
| Bluetooth | Bluetooth 5.2 BLE | — |
| Positioning / GNSS | Dual-band, six-satellite positioning | — |
| Audio & communication | ||
| Microphone | Built-in microphone | — |
| Calling | Zepp Flow voice control and speech-to-text replies when paired with a supported phone | — |
| Sensors, health & fitness | ||
| Sensors | BioTracker 6.0 PPG biometric sensor with blood-oxygen support, accelerometer, gyroscope, geomagnetic sensor, barometric altimeter, ambient-light sensor and temperature sensor | Photoplethysmography sensors and skin-temperature sensing |
| Health & wellness features | Heart rate, blood oxygen, stress, PAI and temperature insights; wellness measurements are not intended for medical diagnosis | Continuous heart rate, HRV, respiratory rate, skin-temperature variation, strain and recovery tracking; not a medical device |
| Sleep tracking | Sleep stages, naps, sleep score, breathing quality and recovery insights | Automatic sleep detection, sleep duration, stages, sleep need and sleep performance |
| Sports / workout modes | More than 170 sports modes | Automatic and manual activity tracking |
| Training & outdoor features | Offline maps and navigation, GPS privacy controls, Zepp Coach and advanced running/outdoor metrics | — |
| Diving / depth features | Freediving support to 45 m under applicable certification | — |
| Battery & durability | ||
| Battery capacity | 700 mAh rated | Internal rechargeable battery; capacity not published |
| Battery life | Up to 27 days typical use, 40 days battery saver, 13 days heavy use, 42 hours accurate GPS or 180 hours maximum GPS | Approximately 5 days |
| Charging | Magnetic charging base; approximately 3 hours; USB-C cable is not included | WHOOP 4.0 slide-on wireless Battery Pack for on-wrist charging |
| Water resistance | 10 ATM; suitable for swimming and supported high-speed water sports subject to manufacturer guidance | IP68; water-resistant up to 10 m for 2 hours; swimming and showering supported, not diving |
| Durability / certifications | EN 13319, ISO 6425 and GB/T 18828 certification for freediving to 45 m; operating range includes -30°C to 70°C | — |
| Compatibility | ||
| Phone compatibility | Android 7.0 or later; iOS 14.0 or later | Compatible iPhone or Android phone; current support recommends iOS 18+ or Android 10+ |
| Companion app | Zepp app | WHOOP app |
| Colors | Onyx, Lava or Haze Gray | — |
| 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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