Over 100 Sports ModesThe Amazfit T-Rex Pro features over 100 sports modes, and can be used to monitor critical data such as workout heart rate, distance traveled, movement speed, and calories burned in real time for most sports modes, to help you track and improve your athletic performance. | Sleep Quality MonitoringSleep quality is essential to health, and so the Amazfit T-Rex Pro serves as your personal sleep assistant. The smartwatch can recognize different sleep states - such as the light, deep and REM sleep stages, as well as daytime naps, and monitors any potential breathing problems during your sleep. | Strong 18-day Battery LifeWhen fully-charged, you can relax and enjoy up to 18 days of activity and progress with typical usage, or up to 9 days with heavy usage, or GPS continuous working time: up to 40 hours. One Charge for 18-day Amazfit T Rex Pro’s accompany |