Outstanding Battery: With up to 40 days endurance on a basic usage scenario and 15 days on a typical usage scenario, the Bip S battery will keep up with your busy & active lifestyleAmazfit Bip S supports 10 sports modes (Treadmill, Outdoor running, Walking, Indoor cycling, Outdoor cycling, Open water, Pool, Yoga, Elliptical trainer, Freestyle), which also provides data such as track display, speed, heart rate, distance reminders, and excessive heart rate reminders.Water Resistance: The Amazfit Bip S is waterproof to 50 meters. You can wear it while swimming and record swimming data, including stroke rate, stroke times, SWOLF index, tracks in open waters, etc.Innovative Huami-PAI™ Health Assessment System: Eliminates the need to track complicated data and allows you to intuitively understand your physical state at a glance, as well as more concisely and precisely control your health.Built-in Sony 28nm GPS chip which can operate continuously for 22 hoursMultiple Functions: Monitors your heart rate and sleep status like total sleep, light sleep, deep sleep and awake time. Useful reminder functionality such as alarm clock, weather forecast, world clock and incoming call. You also can control phone music playback from your watch.