Xiaomi Mi Band 4 - Black Fitness Tracker

https://www.youtube.com/watch?v=Fu5DSXR-9oQ&t=10 Key Features Display: 0.95-inch color AMOLED touchscreen with 2.5D curved glass. Tracking: Steps, sleep, heart rate (24/7), calories, activities (running, swimming, gym). Water Resistance: Up to 5 ATM (50 meters) for swimming. Battery: Up to 20 days on a single charge. Connectivity: Bluetooth, syncs with Mi Fit app (Android/iOS). Notifications: Shows calls, texts, and app alerts from your phone. Music Control: Control music playback on your connected phone. Sensors: 3-axis accelerometer and gyroscope After factory reset: 1. Install Zepp Life from the App Store. 2. Open it and sign in/create an account. 3. Make sure Bluetooth is ON on your iPhone: Settings → Bluetooth. 4. In Zepp Life, go to Profile → Add device → Band. 5. Keep the Mi Band 4 very close to the iPhone. 6. The band should vibrate and display a pairing request. Tap ✓ on the Mi Band screen to confirm. 7. Wait while the app finishes pairing and, if necessary, updates the band firmware.