If base station of fast trackers alone is imported then it will be classified under HS 847180.

The base station for the Fitness Tracker converts electrical signals from the pedometer into data signals the computer can understand. The base station is powered by the computer, and charges the Tracker when it is physically docked with the base station. The base station is principally and solely used with a computer and meets Note 5c to Chapter 84 as a signal converting unit.

  Hence, it will be  classified under HS 847180.

The tariff classification of the Fitness Tracker is based on functions it perfoms and how it is sold and shipped

What is  Fitness Tracker:

The Fitness Tracker measures the intensity and duration of the user’s physical activities, calories burned, steps taken, distance traveled, and how long it takes one to fall asleep.

When worn, the Fitness Tracker automatically tracks your exercise intensity levels, calories burned, sleep quality, steps and distance. Calories, steps, and distance traveled are displayed on a blue Organic LED display on the device.

The Fitness Tracker stores this information and wirelessly transmits it to a base station that is plugged into one’s computer. The information is then uploaded to a personal Fitness website that allows the user to track their progress towards their personal fitness goals.

If the Fitness Tracker is packaged with the base station, the belt clip, and the wristband and they are imported together and sold as a set, thus they should be classified as a composite goods under  HS 903180  .