The overall design aesthetic is unchanged, but there are a few key upgrades that make the fitness band stand out: it is the first in the series to feature a color AMOLED screen, and the display itself is larger and is of a higher resolution. Xiaomi is continuing that trend with the Mi Band 4. Xiaomi continues to dominate the wearable space, with the Mi Band 4 offering several upgrades. Every year for the last three years, Xiaomi has rolled out exciting new features to its Mi Band series. Last year’s Mi Band 3 retailed for just $25, offering a heart rate sensor, 5ATM water resistance, and a 0.78-inch OLED panel. Coming in at under $50, the Mi B… The band also has better workout tracking — including swimming — and it has the same weeks-long battery life as its predecessor. The Chinese manufacturer dominates the wearable segment on the back of the Mi Band series, and it’s easy to see why — there isn’t another budget fitness band that gives you quite as many features.