Your life will start to transform in a positive direction when you put a Mi Band 4 around your wrist. The compact AMOLED colour screen of the compact bracelet is almost 40% larger than its predecessor. It shows the most important physical data parameters, reports calls and messages, and allows you to control the music player of the connected smartphone. The built-in virtual trainer is always there and helps with motivating tips, reminds you to move after sitting too long and measures your heart rate. The bracelet recognizes running, cycling, strength exercises and swimming up to a depth of 50 m, as well as keeps an eye on regaining strength during sleep. You only need to remember to charge it a few times a month, because the Mi Band 4 battery lasts for up to 20 days.