Broad compatibility: This smart watch can support most android and ios phones(Bluetooth 4.0, Android 4.4 and iOS 8.0 and above) Quickly Check your Fitness Status: Colorful Screen will let you see the time clearly even under the sun. Tracks your steps, distance, calorie burned, heart rate, sleep tracking; and record data both in smartphone App and watch. It's your fitness Companion Special Design for Women Girls: After you set to "female" users in the "H Band" app, you can see the Female physiological period management, it will prompt you to set the female cycle function: only the menstrual period, preparing pregnancy period, pregnancy period, and mother period. It's your personal healthy assistant Battery Life & Perfect Size: Smartwatch Android -100mAH lithium battery, average using time is 3-4 days based on usage. Case Diameter: 39.5 mm; Case Thickness: 8.5 mm; Using IP68 waterproof, enables wear in showering or raining even swimming Work Over Your Expectation: Easy to pair with a smartphone. Timely syncs the incoming caller ID, SMS content, app notifications push (like Facebook, Twitter, WhatsApp). You can read the messages and reject the phone. It's your work partner