The Amazfit Bip S has outstanding battery life thanks to the electronic components selection and power optimization technology. Test conditions for 40-day battery life: factory default dial, running once a week for half an hour, 100 notifications per day, default brightness 10 percent. In actual use, battery life is related to various factors such as settings, operations, and operating conditions, and therefore may differ from laboratory data. Super lightweight: Comfortable to wear every day, for sport and sleep tracking. Waterproof: 5 ATM with Swim Tracking Notifications: Receive notifications for calls, messages, emails, and other apps on the always-on color touch display. Multisport tracking: 10 sports modes to track your runs, cycling and more with mapped routes, detailed stats and heart rate zones. Latest technology: The built-in Sony 28nm GPS chip, through several product updates and iterations, as well as continuous optimization and adjustment, performs even better in satellite search speed, positioning accuracy, and power consumption. GPS can operate continuously for 22 hours. Test conditions for 22 hours GPS continuous working time: GPS continuously on, heart rate always on. In actual use, battery life is related to various factors such as settings, operations, and operating conditions, and may differ from laboratory data. Always-on display: the reflective touch screen provides an at-a-glance view for a time, date, steps, weather, sports stats, etc.