Xiaomi fitness band 2 is the best and cheapest fitness band available in the market.
Xiaomi fitness band comes with a oled display and a very strong battery which will last upto 20 days easily.
It is also water resistant comes with IPX6 rating
Xiaomi fitness band comes with heart monitoring sensor it also come with additional features like step counting, calories burned, walking distance, and comes with pedometer sensor.
Mi band 2 has a very good display which is easily visible in the sunlight what additional mi could have been added is the caller name display so that it can be identified who is calling no need to take out the phone.