– 5 ATM waterproof to 50 metres: Recognises 5 different swimming styles and records 12 data sets, including the swimming rhythm and strokes. Battle ropes: Whether you’re doing a high-speed battle rope training or an aerobic battle rope session, the Mi Smart Band 4 will track your heart rate, the calories burned and more. Running: Tracks your pace, counts your steps, and ensures a secure workout, whether you run short or long distances. Power walking: 5 basic data sets that can assist you support your power walking efficiency. Cycling: Checks your heart rate in real time to ensure the best workout whilst riding mountain paths or cycling around the city. Terrain monitoring: Correctly tracks light and deep terrain, as well as the heart rate right through the terrain training that can assist you adjust your patterns. Inactive alerts: Stay active by receiving reminders to stand up and move. The screen size is larger, it is 21.6 mm long and 10.8 mm wide. Box contents: 1 x Xiaomi Mi Band 4, 1 x wrist strap, 1 x user manual (English language not guaranteed), 1 x charging cable.

Full-colour AMOLED touch screen: the full-colour AMOLED touch screen is 39.9% bigger and brighter than ever; for a wider and more colourful view directly on your wrist; a beautiful change.
Larger reading touch screen: The Xiaomi Mi Band 4 has a large AMOLED screen (0.95 inches) with 120 / 240 pixels. You’re going to instantly see calls, text messages, app notifications and see which music is playing. It not only alerts you through vibration on the wrist when your phone receives direct calls, messages or other notifications, but also shows the details, such as the content, directly on the screen.
24/7 heart rate monitoring: Correctly reads heart rate changes 24 hours a day and detects the current heart rate at any time. Alerts you when your heart rate is too high and protects your health all the time.
Swimming activity monitoring: 3-axis accelerometer, 3-axis gyroscope; 5 ATM water resistance up to 50 m. Xiaomi Mi Band 4 works well at 50 metres underwater. It is suitable for all of your daily activities and you won’t have to worry when you shower, wash, run in the rain, swim or surf.
Battery up to 20 days: The Xiaomi Mi Band 4 has a greater battery capacity (135 mAh) and can last up to 20 days with normal use.