Description: Do you want to personalize your own life? Do you want to monitor your running? Or do you want to know your body condition clearly in daily life? This Xiaomi 4 smart watch can meet all your needs. Monitoring your running, your sleep quality and heart rate. What's more, it still has other practical functions such as call, and message notification, sedentary reminder, pedometer, etc. You deserve such an intelligent partner! Why not come and get to know more about it? Main Features: 0.95 inch AMOLED color screen, increased brightness and display area, easy to watch, durable to use. Accurately read the heart rate, blood pressure / oxygen changes, check heart rate in real time, keep health condition in control at all times. Monitor different sleep stages accurately, scientifically evaluate sleep quality and find out the cause of trouble sleeping. Care about your sleep quality and adjust sleep habits. Simulate your payment code. 50m waterproof, can withstand temporary soaking like raining, bathing, hand washing, etc. Messages notification: no worry about missing an important message and phone call. Intimately add a sedentary reminder function, when you work for a long time, it will remind you to have a rest. Parameters: Screen: AMOLED Waterproof level: 50m System requirement: for iOS 9.0 and above, for Android 4.4 and above Battery capacity: 135mAh Charging time: 2 hours Standby time: 20 days Bluetooth version: 5.0 0.065 Package weight: 0.085 kg Package Size(L x W x H): 12.00 x 5.00 x 12.00 cm / 4.72 x 1.97 x 4.72 inches Package Contents: 1 x Smart Bracelet, 1 x Charger About Water-resistant Watches Water Resistant Watches are sealed to witstand some pressure. Water resistance is tested in measurements of atmosphere (ATM). Each ATM denotes 10 meters of static water-pressure. This is not the depth to which a watch can be worn. Many watch cases will list the basic measurement of 1 ATM as "water-resistant." These watches will withstand small splashes of water but should not be worn while washing the hands or submerging the hands in water. Remember, water resistance is tested under static conditions. Wearing a watch which is 50 metres water resistant in water will expose the watch to a much greater pressure than during a 50 metre static test. Therefore the number of metres shown on the watch does not indicate the depth that the watch can be taken to. Here is a general guide 50M = 5ATM = Shower Proof - it's ok to get it wet a bit. 100M = 10ATM = Extended Water Exposure good for swimming or snorkeling. 200M = 20ATM = Pressure Resistant made for Scuba and Skin Diving. Q: A 100M watch is surely strong enough on a shallow dive?! A: No! It isn't because it has not been high pressure sealed. 100M watches are only good for Snorkeling! Q: What will happen if I try to dive with a watch that is less than 200M Resistant? A: The watch's seal will be broken, it will flood and break..irrepairably. Q: So which watch to buy? A: Think about what you need it for and bear in mind that Scuba Watches (200M) look really cool but tend to be very heavy, which makes them uncomfortable for everyday use.