LENDOO I5 Plus Smart Bracelet Fitness Tracker Sport Wrist Bluetooth 4.0 Pedometer Tracking Calorie Health Sleep Monitor Wristband for Android IOS Phones (red) Waterproof DesignIP65 Living Waterproof Design, No Need to Remove Even When You Wash Hands. (Please Take Off When You Diving and Swimming). For first time use, need charge over 1-2 min, otherwise the bracelet may not response, bracelet need recovery. Almighty FunctionsSteps Counting, Mobile Anti-lost, Camera Remote Control, Sedentary Reminder, SMS Reminding, Call Reminder, Incoming Calls Show, Calories Burned Measuring, Sleep Management, APP Message Reminder (Like Facebook, Twitter, etc). Smart Technology0.91" OLED Touch Screen with Gesture Senser Control, the Screen Will Automatically Light up When You Turn Over Hand, Act as Traditional Watch. Comfortable WearingAdjustable Silicon Band Fit (5.5" - 7.6") for Different Wrist Size, 25g Light Weight Makes You Feel Free. Easy CompairingRequired Bluetooth Version 4.0 and Above, Fit for Smartphones Over Android 4.3 Version and IOS 8.0 Version. Use Together with APP "ZERONER" or "ZERONER HEALTH".It can work together with the app or work seperately, but when using seperately, some functions will be limited, like message push, call reminder, etc. these functions can work together with the connected phone but limited to basic functions like step counting, walking distance and calories burnning.