If you think ourproducts are useful, please introduceyour friends to buy themYour 5-StarPositive Feedback is much appreciated!Welcome to Shopping Here!”How to Charge Remove the bands off the tracker host and you can see the built-in USB plug with metal pins, insert the USB plug into a USB charger(such as phone charger) for charging, no charging cable needed1.if the watch cannot be started, please charge it for 2 hours before use. 2.watch no need charger，directly charge in the usb charger or in the computer usb port.Dear,thank you for your patience.All order need about 2 weeks in shipping.Feature Function: Blood PressurePassometerSleep TrackerPush MessageHeart Rate TrackerBlood oxygenAlarm ClockRemote ControlSocial Media NotificationsMessage ReminderCall Reminder1.3 inch large screen color screen smart bracelet APP Language: Korean,Russian,Spanish,English,German,Italian,Japanese,French,Portuguese Specification:Style: SportCase Material: PLASTICWaterproof Grade:Life Waterproof IP67Screen Type: Color LCDBand Detachable: YesTouch Screen: YesCompatibility: All CompatibleBlutooth: 4.0Bettery: 180mAhSystem: IOS 9.0 & Android 5.0 aboveAPP name: Lefun health, please scan the code in the manual to download and install the app. Package include:1 * Smart bracelet1 * User manual1 * Retail box(it is USB charging, there is no charger in the box)Note:Wearable devices monitors human activities through electronic sensors,and they are at the consumer electuonics level.It’s normal for certain deviation.The user should treat data objectively.–Please do not compared to hospital equipment about reading,it is NOT a medical device!–Before using, scan the QR code on the manual to download the app and connect it to the watch with APP. — For Android user: Please always authorize the app access to all phone functions and always let it operating on. and please turn on the GPS on your phone before you connect it.–Please charge it for 2-3 hours when you receive it. it was run out of power after the long delivery. Thank you!