Bluetooth version: Bluetooth 5.0 Chip : RealTek8762DK Memory : RAM 64KB + ROM 128M Waterproof : 5ATM & IP68 Waterproof Display : 1.71 inch TFT screen, resolution 280*320 Battery : 380mAh polymer battery Connect Phone APP Name : Da Fit Support compatible connection mobile phone version : IOS 9.0 and above, Android 6.0 and above Strap size width : 20 mm ( support replacement strap) Specifications: 1. Military Standard Verification - The special composite material and metal case make our men's and women's smartwatches pass dozens of standard tests, including temperature, low pressure altitude, dust resistance, salt spray, liquid pollution, etc. Fitness tracker smartwatches can undoubtedly be reliable companions for your outdoor activities. 2. Extremely Damage Resistant - Our fully enclosed ultra-thin case design Android smartwatch can be submerged in 50 meters (5ATM waterproof) deep water. Our military watch is a proven survivor of extreme conditions and has passed drilling, breaking and hot steam sanding tests, making sports watches suitable for high temperature and high pressure environments. 3. Efficient life - To make your daily life easier, the Android phone smart watch is equipped with a touch screen with features such as 1.7 inches (about 4.3 cm) high-end brightness and 280x320 resolution, providing a better visual experience. Due to the 380mAh Li-polymer battery heart rate monitor watch has more than 50 days of standby time. Use 10 days to communicate and entertain all week. 4. Know your health status - This blood pressure watch has real-time monitoring, which collects data about your health, heart rate 24 hours and real-time blood pressure and blood oxygen. Package Included: 1*Smart Watch 1*Charging cable 1*User Manual