【Compatibility】 Support system: iOS 8.0 or above (iPhone 4S, iPhone 5 / 5S / 5C, iPhone 6 / 6Splus, iPhone 7 / 7S plus, iPhone8 iPhoneX, etc.). Android 4.4 or higher (Huawei Mate7 / P9, LG, Samsung, etc.). 【Message notification】 Your Dwfit Fitness smart watch will make life easier and smarter. When you connect this fitness tracker to your phone, you will never miss your other calls / messages. If you sit for a long time, the watch will vibrate to remind you to lie down, which will help you kids reduce and stay tired. [IP68 Waterproof] IP68 waterproof index of the tracker helps you care free while swimming, diving or taking a shower. It only needs to be taken off before a hot bath. 【Automatic heart rate monitor & sleep monitor】The kids fitness tracker can automatically monitor your kids daily real-time heart rate and track how well your kids sleep at night. Get the data about your kids sleeping trends through the night via the app.The vibrating alarm clock can wake up your kids without disturbing others. 【Activity Tracking】 Monitors your steps, calories burned, kilometers traveled and active minutes during the day. More different sport modes help you to better understand individual activity values ​​and thereby make your children's training units more effective.