1.9-Inch large screen, with high resolution, easy to view and read the data With the waterproof design, whether washing hands or daily use, you don't have to worry about water ingress Support multiple exercise modes, calculate your exercise time, calorie consumption, exercise heart rate, etc., to help you live a healthy life Health monitoring: heart rate measurement, blood pressure, sleep monitoring, etc With built-in 260mAh button battery, rechargeable design, providing long working time Great for sport, old people, boys, girls, suitable for most people who need to monitor their health condition Specification: Product number F21Pro Mobile operating system iOS: support 10.0 and above systems, Android: support 5.0 and above systemsHarmonyOS: all support App Joeme Fit Main Function Pedometer, distance, calorie, heart rate, blood oxygen, blood pressure, blood sugar, body temperature test, sleep monitoring, music control, stopwatch, countdown, calculator, weather display, female menstrual period function, remote control camera, raise the wrist to brighten the screen, find the phone, call reminder, message reminder, alarm clock reminder, sedentary reminder, heart rate alarm reminder, etc. Multiple dials: 4 default dials + 1 market dial + 1 custom dial Sports Mode outdoor running, walking, treadmill, indoor walking, trail running, race walking, outdoor cycling, indoor cycling, mountaineering, outdoor hiking, rock climbing, skateboard, roller skating, parkour, elliptical machine, rowing machine, climbing stairs machines, steppers, spinning, indoor fitness, cross aerobics, aerobics, group gymnastics, strength training, step training, free training, high intensity interval training, yoga, soccer, beach soccer, basketball, volleyball, beach volleyball, baseball, flying disc, etc CPU JL7013A + plug-in 64M FLASH Gsencor Sensor ROHM KTJ3-1057 Heart Rate Sensor HX3605 Vibration Reminder Motor Vibration Reminder Waterproof Level IP67 APP Support Language English, Simplified Chinese, Traditional Chinese, Korean, German, Japanese, Russian, Spanish, Italian, French, Vietnamese, Portuguese, Persian, Polish, Turkish, Czech, Slovak, Hungarian, Arabic, Thai Watch Support Language Simplified Chinese, Traditional Chinese, Japanese, English, German, French, Portuguese, Spanish, Thai, Arabic, Korean, Polish Screen Size 1.9-inch ; resolution: 280*320 Type IPS Round LCD Bluetooth-compatible Version Bluetooth-compatible 5.3 Battery Capacity 3.7V 260mAh Standby Time 7 days Charging Method magnetic charging cable Charging Time about 2 hours Package included 1 x Smart Watch 1 x Charging Cable 1 x English User Manual Other things not included Specifications Brand N/A Color Black Packaging Type Colored Box Plug Type (For Supply) N/A User Manual (Language) English Gross Weight 0.101kg Volume Weight 0.057kg Package Length 15.000cm Package Width 9.000cm Package Height 1.900cm