Huami is a producer of Mi Band armbands and Amazfit clocks. If you have at least one device with Xiaomi's broad ecosystem, then it is most likely the band We Band from Huami. The majority of shares in the Huami company have Xiaomi, which is why it has colloquially assumed that Mi Bandy is the Xiaomi band.
9 July Huami will present a real treat for fans of The Avengers. A limited edition of the smartwatch with the Iron Man theme will be presented. On the Chinese social networking site Weibo, a graphic presenting a piece of the watch has been made available.
If you are a fan of The Avengers from outside China, unfortunately you will have limited access to the limited edition. So far limited editions have been sold only in China, so I think that now it will be similar.