analyze heart rate changes during exercise and provide dynamic information such as steps, distance, time, calories, etc. to save the data.[Smart Reminder]After connected to the phone, it will provide synchronous display of message, call or social APP to remind you of important information.[IP67 Waterproof]Can be worn for daily hand washing, rain, sweat or other water splashing, easily adapting to various environments (not for swimming, bathing or diving).[Large Capacity Battery] 230mAh battery offers 20 days of standby time, 7 days of normal use time and 5 days of heavy use time, farewell to frequent charging. [More functions]Weather, Music control, Remote camera, Calendar, Sedentary reminder, Stopwatch, Countdown, Siri, Flashlight, etc.Parameters:Screen: 1.3" Full-touch Screen Resolution: 320 * 320Compatibility: Android 4.4 and above or iOS 8.2 and above; Support BT 4.0Battery Capacity: 230mAhCharging Time: 1.5HWorking Time: 5-7 days Standby Time: 20 daysApp: M2wearSpecifications:Model: Z2Case Material: MetalStrap Material: Silicone Color: Black / Pink / Blue (Optional) Water-Resistant Level: IP67Dial Diameter: 42mmDial Thickness: 10mmStrap Width: 22mmStrap Perimeter: 260mmItem Weight: 33g / 1.16ozPackage Size: 14.1 * 9.6 * 2.2cm / 5.55 * 3.78 * 0.87inPackage Weight: 88g / 3.1ozNote:* Please read the user manual carefully before using this product.* The watch is NOT suitable for swimming, bathing or diving. * There may be slight difference in color due to shooting angle and light. Please refer to the real object.Package List:1 * Smart Watch1 * Charging Cable1 * User Manual