The Bowflex SelectTech 560 Dumbbells are the world's first-ever smart dumbbells that offer a fully interactive experience to work out harder and smarter. Each dumbbell adjusts from 5lbs to 60lbs (2.3 kg to 27.2 kg).To select your weight, just twist the handle, no more turning two dials. Integrated Bluetooth tracking combines with the Bowflex SelectTech® App to track weight, count reps and sets, and provide advanced video coaching to ensure perfect form every time. Durable molding around metal plates provides for a smooth lift off and quieter workouts. It combines the best features of the selling selectorized dumbbell in the world with cutting edge performance technology. Its compact design reduces the number of separate dumbbells from 32 down to only two - making them the perfect addition to any home gym. With the help of a 3DT app, a user can track workouts and set goals. Once it downloaded, users can sync the app with Apple Health, Google Fit, MyFitnessPal and UA Record. The 3DT app also comes with 70 preloaded step-by-step workout videos.