About this item

• AMOLED true color display with more content. 1.1" large screen with dynamic color display, all information is displayed on one screen. The display area is again increased by about 20%, so that incoming calls, information and reminders are clearly visible, and the dynamic dial display is realized for the first time.
• New Charging Method---Magnetic Charging. Start charging as soon as they touch. Charging time less than 2 hours and endurance of more than 14 days. And 8 colors summer vitality wristband. There is always one that makes you fall in love with it. Up to 8 color wristbands, just for your summer wear more energetic.
• 11 professional sports modes. Support running, walking automatic detection, speed reminder, whole kilometer reminder, high heart rate reminder. Upgraded sensor, makes body monitoring more accurate. Six-axis sensor: low-power three-axis acceleration sensor + three-axis gyroscope
• 24-hour smart sleep monitoring, a good night's sleep, very simple. Upgrade the sleep analysis technology, and the accuracy rate is again increased by 40%, which can professionally interpret the sleep characteristics of each time period and provide scientific suggestions for you to quickly optimize problems such as insomnia.
• Your personal health manager, monthly reminder for small secret records. The physiological period and ovulation period can not only be recorded in full, but also reminded intimately. Pressure monitoring and Breathing training helps you get relaxed effectively.

• Use built-in GPS to see your pace and distance on screen during outdoor runs, rides, hikes and more and see a workout intensity map in the app that shows your heart rate changes along your route
• With Active Zone Minutes, feel a buzz when you reach your target heart rate zones during exercise, and celebrate when you earn extra minutes outside of exercise
• Get a 90-day free trial of Fitbit Premium to help you stay active, sleep well and manage stress. Unlock it all in the Fitbit app. (Valid payment method required. Cancel before free trial ends to avoid subscription fees. Offer valid for new Premium users only)
• Use 24/7 heart rate to track resting heart rate & better measure calorie burn
• Play your favorite songs and playlists with Spotify app controls on your wrist. Also make secure purchases with Fitbit Pay and get call, text and smartphone app notifications.
• Track workouts in real-time with 20+ goal-based exercise modes. It’s also swimproof and water resistant to 50M so you can track swims, wear in the shower and more
• Multi-day battery lasts up to 7 days and up to 5 hours when using built-in GPS (varies with use & other factors)
• Track sleep stages & review your in-app Sleep Score for an easy way to see how well you slept.

• Better measure calorie burn, understand resting heart rate & more with 24/7 heart rate tracking and a battery life of up to 7 days (varies with use and other factors); Charge time (0 to100 percent) 2 hours
• Choose from 15 plus exercise modes like run, bike, swim, yoga, circuit training and more, set a goal, and get real time stats during your workouts to see how you can keep getting better
• Automatically record time spent in Light, Deep and REM sleep stages and see activity trends, health insights and personalized guidance in one place with Fitbit Today. Operating temperature is -10° to 45° Celsius
• Swim proof and water resistant to 50 Meters so you can track swims and wear in the shower; We do not recommend wearing Charge 3 in a hot tub or sauna; Also connect to smartphone GPS for real time pace and distance during outdoor runs and rides
• Stay connected to your day with everyday apps for weather and more and get call, text and smartphone app notifications on your wrist; Small wristband Fits a wrist between 5.5 to 7.1 inches; Large wristband Fits a wrist between 7.1 to 8.7 inches
• Radio transceiver: Bluetooth 4.0. Syncing range up to 6 meters

About this item

• Wristband width 18mm, Adjustable wrist strap length 155-216mm
• Battery Life: 135mAh battery capacity built in the Mi Band 4, max working time up to 20 days after a full charging.
• Health Monitoring: Support heart rate monitoring, heart rate alerts, sleep monitoring, idle alerts; Monitoring your health data o matain your healthier body
• Activity Tracking: Comes with 6 workout modes: Treadmill, exercise, outdoor running, cycling, walking, swimming Counting step, distance, calories burned during sports
• 5ATM Water Resistant: Up to 50 meters water resistant rate, freely to wear Mi Band 4 when running and exercising
• Display: 0. 95-inch Colorful AMOLED display with 120 x 240 pixels resolution, up to 450 nits screen brightness