I recently buy this mi band from the official website of xiaomi. The band has awesome features and is very appropriate in details. This is avalible in two variants. There is one which has heart rate sensor and other has not.
There is difference of the cost also. The band can tell you how much calories you have burnt, the sleep structure.
The deep sleep and light sleep are also captured by it. The band can be synced with any android smartphone which has kitkat or above and bluetooth 4v. This band has classy and awesome finish. The band is waterproof and scratch proof also. The battery takes about 2 hours to charge and lasts for more than a month.The build quality is very good and it has one year of service warranty from xiaomi. It works best with xiaomi phones. The band is just awesome . I an using it as a casual band and it take care of my fitness . It is the best band at the price range of eight hundred to thousand rupees. It can be said as a battery beast. I am currently using it and suggest it to all. Best product by xiaomi.