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DescriptionHaylou RS4Smart WatchBeauty on Your WristCompact BodyHD Large DisplayHaylou RS4 is specially made for sports. Easily check information with the 1.78 inches large touch control display.Creative Strap DesignThe lightweight metal bezel is designed with a technological aesthetic.And the upgraded silicone strap is skin-friendly and breathable for a long time wearing.New Look Whenever You WantThe APP watch faces are constantly updated. Customize the watch face with images of your choice or even your picture.Blood Oxygen TestingSleepiness and fatigue after high-intensity exercise or work is a sign of insufficient oxygen in the body.Raise your wrist to test your blood oxygen level and keep your health under control.Heart Rate MonitoringHaylou RS4 can accurately detect your heart rate 24 hours a day and detect even slight change, welly knowing your every heartbeat.Sleep MonitoringThe percentage of deep sleep is an important criterion of sleep quality.Haylou RS4 actively monitors sleep time and status to help you develop good sleep habits.Breathing TrainingPerform guided breathing exercises at a set rhythm to alleviate stress anytime and anywhere, easily restoring vitality.12 Workout ModesHaylou RS4 has 12 workout modes. It can record real-time exercise data, helping you track and improve your athletic performance.Active Tracking of ActivitiesWith a built-in high-precision motion sensor, Haylou RS4 can actively record your daily exercise behavior. Set your goals and strive to realize them.Alipay Offline PaymentThe watch supports Alipay offline payment. Forget to take your phone and wallet?Swipe left on the homepage to enter the scanning code page, raise your wrist to make the payment.10 Days Battery LifeBattery life can last up to 10 days in daily use mode, and it can be used for about 25 days in basic use mode, saving the trouble of daily charging.Real-time Message ReminderConnect to mobile phone via Bluetooth. Calls, WeChat, and various APP information can be synchronized withthe watch in real-time so that you don't miss every important moment.IP68 WaterproofThe Haylou RS4 watch is IP68 waterproof. There is no need to take off the watch when washing your hands,and you can easily cope with sweating during workouts or stormy rains when you are out.More Practical FunctionsHaylou RS4 is a small assistant on your wrist.More practical functions to make smart life more comfortable.Specifications: - Bluetooth: V5.1 - Sizes: 45.2 x 37.2 x 11.1mm - Sensors: Heart rate sensor, motion sensor, blood oxygen sensor - Strap width: 20mm - Weight: 48.6g (with strap) - Display: 1.78 inches AMOLED display - Resolution: 368 x 448 - Battery: 230mAh - Battery life: About 12 days (24 hours heart rate monitoring) - Compatibility: Android 6.0 and above, iOS 11.0 and above. Supported functions will vary with different watches, mobile phones, and countries.