Xiaomi Mi Band 4 Black. Key Features. View call text & app notifications Water resistant up to 50m Up to 20 days battery life 24/7 heart rate monitoring & sleep tracking Full colour AMOLED touch display. Notifications on your Wrist. Instantly view call text app notifications & music currently playing straight on your wrist. Keep your hands free as you keep up with life. Sleep Monitoring. Accurately tracks light & deep sleep as well as heart rate during sleep to help you adjust your sleep patterns 24/7 Heart Rate Monitoring. Safeguard your health at all times. Alerts you when your heart rate is too high Wristband Alarm. A light vibration gently wakes you up for a more comfortable morning without waking those around you Idle Alerts Stay active
- The Mi Band 4 will remind you to get up & get moving if you've been sitting for too long..