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V66 Sport Smartwatch BT 4.0 IP67 Waterproof Heart Rate Monitor Smart Wristband Health Bracelet for Android IOS Phone midi dress Q: Why do you wearMain Features: Heart Rate Monitor All weather record your heart rate so that you can set a more suitable exercise plan Bidirectional Anti lost Convenient to find the wristband or the phone by connecting the Bluetooth Calls Alert Remind you calls or SMS in order to not miss any important information Sleep Monitor Record your deep sleep and light sleep time, about daily, weekly and monthly data, convenient to improve your sleep quality better APP