The all-new full colour AMOLED touch display that’s 39.9% larger and brighter than ever before. Instantly view call, text, app notifications and music in play. Keep your hands free as you keep up with life. Whether you're doing high-speed battle rope training or an aerobic battle rope workout, Mi Smart Band 4 will track your heart rate, calories burned and more. Tracks your pace and step count. Maintain a safe workout, whether you're running short or long distance. Check your heart rate in real time to make sure you get the best workout as you climb mountain roads or dash around the city. Improving your daily energy starts with understanding your sleep patterns. Accurately tracks light and deep sleep as well as heart rate during sleep to help you adjust your sleep patterns. A light vibration gently wakes you up for a more comfortable morning. Records your health data to help you get the most out of life.