Mi Band Selfie is a free Android app developed by Aleh Tsitou that allows users to use their Mi BandHRX & Amazfit Bip/Arc as a remote shutter for their phone's camera. The app connects to the bracelet via Bluetooth and vibrates when connected. The user can then open one of the supported camera apps, including Open Camera, Circle Camera, Night Selfie Camera, Bacon Camera, and Free Camera, and take photos by pressing the button on their bracelet. The app is straightforward to use, and the instructions for connecting the bracelet are easy to follow.

However, one issue that users may encounter is that the app may not connect to the Mi Band 2 or may be connected but not work correctly. In such cases, users need to turn Bluetooth off and on, and the app will connect and work stably. Moreover, the app does not work with all camera apps, limiting its functionality.

Overall, if you are looking for a simple and easy-to-use app to take photos remotely using your Mi Band 2 or Amazfit Bip/Arc, Mi Band Selfie is an excellent option to consider.