The Reflex Active Activity Tracker is designed to help you monitor your activity through the day and encourage you to meet your goals. Lightweight and comfortable with an adjustable strap, the features include: touch screen, full colour display, step counter, call alerts, calorie tracker, alarm, message notifications and Bluetooth. Battery life up to 7 days. Includes USB charging cradle and instruction manual including guarantee and care guide. This activity tracker requires you to download the free Reflex Active app on the App store or Google Play. The Reflex Active app will work on the following smartphones: Android (version 4.4 and above) and Apple iOS (version 7.0 and above).