Meicent I5 Plus Bluetooth 4.0 Wireless Fitness Tracker / Activity Tracker Smart Watch Main Features: Step Count, Calories Consumption, Touch control, OLED display, Alarm, Sedentary Alarm, Sleep Monitor, GPS Sport Record, Easy Camera(Remote Capture), Time/Date Display, Reminder, Find your phone Connection: Install "Zeroner Health" in App / Play store, or you can scan the QR code ,which is print in the back of the package. Then connect with the phone via Bluetooth Compatible OS: IOS 7.0 or later; Android OS 4.3 or higher, Bluetooth 4.0; Such as: iPhone 5s /6s /7 , iPod touch 5, Samsung S7 /S6 /Note 5 ,Sony, LG,HTC ect (Not suit for Windows Phone) IP65 living waterproof, you can wear it when you are swimming, long working time. and Build-in 75mAh Li-battery, simple charge, no need the USB cable, plug directly in the computer or other USB outlet for charging, standby time: 5~7 days Comfortable & Wearable: perfect to fit your wrist with adjustable wristband, Light and durable. And wearable maximum length: 7.6 inch, wearable minimum length: 5.5 inch, widest point length: 0.7 inch