XIAOMI Watch S1 (Black), One Size

Sapphire Glass, Stainless Steel Frame, Leather Strap

1.43" AMOLED Touch Display

All-Day Blood Oxygen Saturation SPO2 : stayed tuned with your body, measure your body oxygen saturation to keep on top of your respiratory health

Battery Life: up to 12 days on normal mode, up to 24 days on battery saver mode

5ATM Water Resistance: Up to 50m water resistance

Heart Rate Monitor: 24-hour smart heart rate monitoring with PPG biosensors for up to 50% increased accuracy and vibrating heart rate alerts when heart rate is too high.

Sleep Tracking and Score: 24-hour sleep monitoring tracking your sleep cycle through REM, light and deep sleep. Record quality of Naps. Provides sleep score and tailored scientific advice to help you improve your sleep

Activity Tracking with 117 Sports Modes: Rowing Machine, Elliptical, Yoga, Outdoor Running, Outdoor Cycling, Pool Swimming, Indoor Cycling, Jump Rope, Treadmill, Power Walking, Freestyle, Basketball, Boxing, HIIT, Ice Skating, Zumba and more