14-day Ultra endurance mode
You can switch anytime to the Ultra endurance mode for an amazing 14-day battery life, while maintaining various functions such as 24-hour heart-rate monitoring, notifications, and 11 sports modes.
70 Hours Continuous GPS
Freely adjust the power consumption of your endurance sports modes such as trail running, outdoor walking and climbing, so you can get from 35 hours to an impressive 70 hours of GPS continuous operating capacity.
BiotrackerTM Heart Rate Sensor & 4-Satellite / 3-Modes GPS.
Huami Technology's proprietary BioTrackerTM PPG bio-tracking optical sensor brings heart-rate monitoring accuracy to a new level, which is comparable to the accuracy of sports heart rate bands. In addition to the 24-hour heart-rate monitoring, it provides warnings on excessively high heart rate and heart rate interval values. The integrated Sony GNSS chips support four different global positioning systems: GPS, GLONASS, BEIDOU and GALILEO. You can combine any two of them to form three different positioning patterns, which enhances the positioning speed and tracking accuracy.