Jeemak 0.49&rdquo; OLED Smart Bracelet Heart Rate Monitor Pedometer Activity Fitness Tracker Sleep Monitor Bluetooth 4.0 Wristband with app for iOS & Android Smartphone 0.49 inch clear OLED sensitive touch screen, advanced power saving Bluetooth 4.0 version,thermoplastic urethane material which is a popular environmentally friendly material, high tension, anti-static (not to absorb dust) and durable. Multi functions: Date/Time display,Heart rate monitor,Pedometer,Traveled distance tracking,Calorie burning tracking,Sleep monitor,Alarm clock,Sedentary reminder,Incoming call and sms reminder,Social software(such as Facebook,Twitter,WeChat) message reminder(only for Android now),Auto sync between smart bracelet & app(HPlus Watch) on smartphone,Simple analysis report of sports,heart rate & sleeping data, user data record(generally all data can be kept in app around 3 months FREE). IP67 Waterproof design, up to 1 meter underwater(no more than 30 minutes),that means you can still wear it while swimming in pool. Normal washing hands and showering are also OK, but please do not use it in sea(saline water) or hot water(more than 40/104),that may cause defective. Connect with smart phone by Bluetooth,compatible for Android system ( Android 4.3 or above,but some Android 5.1 can't sync ) and iOS system ( iOS 8.0-10.0 ).Humanized design, with gesture recognition function, You only need to raise and turn your arm when wearing, watch screen will automatically light up. Support Real time & All day Heart Rate Monitoring, no need to wear chest trap ! But please note this is a fashion smart digital product, not medical device.With 5-8% margin of error,the data is just for your reference,especially as a sports exercise and weight loss guidance.For Medical use, please order other professional medical devices.