SinoPro Bluetooth Fitness Tracker Smart Bracelet Wristband with Touch Screen Sleep Monitor Pedometer Activity Tracker Call Reminder Remote Capture Functions for iPhone and Android Smartphones Multifunctional Smart Bracelet - Pedometer, distance monitoring, upgrade touch key, calorie tracker, sleep monitoring, alarm clock, call reminder, SMS reminding, remote camera, lost warning. IP67 waterproof means there is no need to take the tracker off during swimming (up to 30 minutes) or showering. It is also totally protected against dust. Vibration reminds you of alarm clock and fitness progress without waking up others or disturbing people near you. The tracker works for one week with every full charge. The wrist strap fits up to an 8 inch wrist and is easy to secure. 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. Urgent notice - We have updated APP "smart wristband app fitness" in Google play and apple store, user manual may tell you to download old APP which may has compatibility issue, sorry for the trouble. Please download this updated APP after you receive the tracker.