ROOP Waterproof Fitness Tracker Touch Screen Activity Tracker Sleeping Monitor Pedometer Watch with Calling/Text Number Display for IOS 7.0+ and Android 4.3+black) Easy-to-read display, view the time of day and your stats right on your wrist with a gentle touch on the screen Download the app from App Store or Google Play Store, this traker is a system, Wristband + Traker+ mobile app, that tracks how you sleep, move and eat so you can know yourself better, make smarter choices and feel your best, It's compatible with iPhone/iPad with IOS7.0+ system (but sometimes iPhone4 does not work reliably, iPhone 4S and later model works great) and Android phone/tablet with 4.3+ system Achieve your goals - Just simply set up your daily activity level the activity tracker will record and indicate completion status besides the vibration function also reminds you fitness progress Long battery life, 7-10 days standby time the tracker works for one week with every full charge