Used for about 10 months. Myzone Chest belt Linked with the app Visualized things like calorie consumption after exercise. Name written on the belt. The following is quoted from the Myzone website: ----- Visualize your effort Measure, record, and share your heart rate. New technology for your exercise. Measures heart rate in real-time with accuracy close to an electrocardiogram. You can maximize the effect of your workout. Myzone App The Myzone app accurately measures heart rate and physical activity, and supports the motivation and community building of people who work out. It has many features to increase motivation for daily workouts and enjoyment, such as gamification elements like challenge functions and setting personal goals, and SNS elements like reactions and comments between follow users.