Reconnect Garmin Watch keeps the connection to your watch and reconnects the watch after being away from phone. It runs in the background and battery usage is very low. The app requires Garmin Connect installed. NOTE: I am NOT from Garmin. The app works for Fenix 3/5, Forerunner 235/735XT/920, vivoactive3, vivoactive HR, vivosmart HR, vivomove HR, and other models.