Xiaomi Smart Band 9

Xiaomi Smart Band 9 puts a 1.62" AMOLED display with up to 1200 nits of brightness inside an aluminium-alloy frame, so it is easy to read outdoors and looks smart enough for work. At 15.8g it is light enough to wear to sleep.

It tracks heart rate, SpO₂ and sleep, supports 150+ sports modes and is 5ATM water resistant. One charge lasts up to 21 days with typical use, and a full charge takes about an hour. Works with Android 8.0+ and iOS 12.0+ through the Mi Fitness app.