Introducing the Jet Black R1 Training Roller + Lite App. The durable Aluminium roller drums offer a smooth and quiet ride with no chance of distortion due to the sunlight or heat. Jet Black have used high end sealed bearings which provide a maintenance free service for the rollers. With the Rollers there is a free Lite app for IOS or Android with Audio Training Sessions, Read and Ride Sessions, Gear Recommendations, Goal Cadence, Session Time, Session Profiles. Separately sold sensors allow upgrades to include, Speed, Cadence, Heart Rate, Power (watts), and Calories Burnt. This is a great way to stay on top of your training and a good way to see how your progress is shaping up. Using the app you are able to upload your recordings to Training Peak or Strava so then you have all of your data in one place.