Xiaomi Mi Smart Band 4 Black

A Reinvigorated Transformation Improving your daily energy starts with understanding your sleep patterns. Sleep Monitoring Accurately tracks light and deep sleep as well as heart rate during sleep to help you adjust your sleep patterns. Wristband Alarm A light vibration gently wakes you up for a more comfortable morning. Mi Fit app Records your health data to help you get the most out of life. A Powerful Transformation 24/7 Heart rate monitoring keeps you safe and healthy. 24/7 Heart Rate Monitoring Safeguard your health at all times. Alerts you when your heart rate is too high. Idle Alerts Stay active as you get reminders to get up and get moving. An Enduring Transformation Stays by your side for 20 days on a single charge.