Xiaomi MI Band 4 The Xiaomi Mi Band 4 delivers fantastic value and features. Upgrades over its predecessor include a color OLED display with significantly improved outdoor viewability and a higher resolution too. The band\'s battery life is also exceptional, and it has improved tracking, making it an easy fitness gadget to recommend, covering the basics and delivering some flourishes as well - a marked improvement and a worthwhile upgrade. Reasons to buy the Xiaomi MI Band 4 Full colour Amoled touch display Activity and swimming tracker Upto 20 days Battery Health Monitoring 135 mAh battery In the box Xiaomi MI Band 4 Instruction Manual Charging cable