The JetBlack M5 is a high quality, magnetic resistance bicycle trainer. Magnetic resistance allows fine tuning of your training schedule through the combination of five levels of trainer adjustment and correct gear selection. Where a fluid trainer increases resistance according to the speed of the flywheel, a magnetic trainer can be overridden, making it suitable for recovery sessions, climbing and specifically tailored workouts. When used with the full range of JetBlack sensors, you can enjoy training sessions identical to those used by professional cycling teams. You can even upload your session to Training Peaks and Strava. All JetBlack trainers come with a lifetime warranty. Key Features & Benefits - Free 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 - Multiple coaching sessions crafted by Olympic cycle coach Murray Healey - Test and monitor yourself with an in built Fitness/Zone test and Training Zone calculator - Upload your workout to Training Peaks and Strava - Trainer is pre-assembled and ready to ride - Rock-solid design is stable for any size or style of rider and the most punishing of training sessions - Suits road and mountain bike wheels between 700c, 29”, 27.5”, 26” and many 24” wheels - Wide Base and Anti Slip Feet keep the trainer still for even the toughest of riders. - Lifetime warranty - Folds into compact shape for easy storage and transport. Lowest profile of any trainer.