Wide application: This smart watch features heart rate measuring, sleep tracking, and call and message reminding functions. User-friendly: With a touch screen, this smart wristband is convenient to operate and use and allows you to customize the dial. Waterproof: With IP68 water resistant, this heart rate smart watch is not easy to be damaged by rainwater and sweat. Sports essential: This waterproof smart watch supports 9 sport modes that can meet your different needs and can track your steps, calories and more. Stylish: This touch screen wristwatch features a stylish square dial and the TPU strap is comfortable and also easy to match. Specification: Body material: Metal+plastic. Silicone material: TPU. Waterproof: IP68. RAM: 256Kb Rom: 1MB flash. Main frequency: 64Mhz. Acceleration sensor: Stk8321 Heart. Flash memory: 64MB. Bluetooth-compatible version: 4.2. Support system: Intended for Android 4.4 and above, intended for iOS 8.0 and above. Voltage: 3.8V. Battery power: 0.24W. Battery capacity: 210mAh. Battery: Polymer lithium battery(Built-in). Charging time: About 2.5 hours. Use time: About 10 days. Standby time: 45 days. Language support: Chinese, English, German, Russian, Japanese, Korean. Working temperature: -20 to 40. Working humidity: 10%-90%RH(Non-condensing). Storage temperature: -20 to 50. Note: There might be a bit of color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Smart Watch