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Fitness tracker Only fit for IOS 7.0 or above and android 4.3 or above, not fit for windows phone or other system. Function: 1. Display Health Parameters:display the time, steps, distance and calorie clearly. 2. Snyc Sports Data with app through Bluetooth. 3. Sleep Monitor: Accurately monitor effective sleeping time and motions every night (including light sleep and deep sleep). 4. Push Reminder(Support Whatsapp,Facebook,Twitter,Skype,Message,Line,SMS etc.).Vibrate to remind you call and message. 5. Remote Capture: Take pictures without help, just use "remote capture" function. 6. Looking Phone: anti phone lost. Specification: 1. Bluetooth 4.0 low-power smart bracelet OLED display 2. Dual-mode control: touch control 3. Build-in USB charger,doesn't need external charger. Plug the black part into official USB port to charge. 4. Download "Zeroner or zeroner healthv3.0"APP from Apple Store and Google Play Store(depend on what firmware of your phone). 5. About 1 hour charging, work for 5 to 7 days (longer battery life) FAQ:Refer to the image 1.Could not convert the watch to 12 hours vs 24 hour format Click advance setting button from your phone, and set your phone from 12 hours or 24 hours.connect the app and smart band. the format would change with the phone. 2.Doesn't have a charger? This product does not need a USB charger, it is a build-in USB charger and pull the silicone band out and plug the black main part into Laptop or computer or other official USB port to chage. Please refer to the product image. Note:We do not suggest to wear for swimming, if there's any operational problem that harass you, please e-mail us, we will assist further. Note:We do not suggest to wear for swimming, if there's any operational problem that harass you, please e-mail us, we will assist further Please do not update to 184.108.40.206 version.It is not stable enough when connecting through bluetooth.