Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I'm very happy with the purchase from this seller. The item arrived in around 4 days, and the watch has just everything that I need to use. I have learned to love Xiaomi. It has many so good products and for a very competitive price. Thumbs up!