Plugs into computers USB port; Automatically receives activity data when compatible fitness device is within range; Enables access to Garmin Connect(TM) to upload activities, download training plans, create a training group, get feedback & encouragement from friends & more; Compatible devices include Forerunner(R), FR, Garmin Swim(TM), Varia(TM) UT800, Vector(TM), vivofit(R) & vivomove(R);