Tracks steps, distance, calories burned, and activity time for wristband is made of a flexible and durable elastomeric material, similar to that used in many sports watches.It also has a surgical-grad more→e stainless steel clasp waterproof for tracking swimming; abrasion-resistant and can be worn in the ocean, shower, pool and moreSmart Tracking automatically recognises selected workouts and logs them into the Fitbit app; Receive call and text notifications on your wrist with a unique vibration mode and coloured LEDsAutomatically track the length and quality of your sleep and set silent alarms to wake you up with a gentle vibration; The LED display lights up when you receive calls, texts and 'reminders …