Supported Fitbit models: Mi Band. Finder for Xiaomi allows you to easily find your lost Mi Device around you before the battery runs out. The app itself uses Bluetooth radio signals to pick up your lost Mi Device and then provide an easy way to guide yourself to its general location. Designed for use with the Mi® platform. Xiaomi is a registered trademark and service mark of Xiaomi Inc., which is not affiliated with the maker of this app and does not endorse, service or warrant the functionality of this product.