Xiaomi Mi Smart Band 6 review Introduction Xiaomi's Mi Smart Band, or just Mi Band as it's known in China, is undeniably one of the most popular wearables across the world. It's small, lightweight, and super cheap, yet it aims to do a ton of stuff. Last year the Mi Band 5 brought a larger OLED screen and a magnetic charging - two major upgrades over the Mi Band 4. This year the screen sees an even bigger boost with an edge-to-edge full-color OLED. Meanwhile the global pandemic made the pulse oximeters (SpO2) a must-have and the Mi Band 6 is keeping with the latest trends by adding a blood oxygen level monitor of its own.