Features:Meticulous WorkmanshipStrictly manufactured body achieves military-standards, sturdy and durable, helping you easily cope with different serious environments and challenges.Exquisite Display1.85" large IPS screen presents clear picture quality even in the sun. Skin-friendly silicone strap is breathable and comfortable to wear.Multiple Sport ModesK55 supports up to 24 motion modes with comprehensive recording of exercise data. Let you exercise more scientifically.Long Battery Life350mAh large battery with low power chip provides up to 20 days of super long standby time, farewell to frequent charging.Convenient BT CallWith waterproof speaker, you can directly dial / answer / reject a phone call, and check contacts / call logs on the watch.Health MonitorAccurately record your heart rate, blood pressure, blood oxygen and sleep data, helping you adjust yourself for a healthier lifestyle.User-Defined Watch FacesA variety of fashionable dials are available for you. You can also customize exclusive dials with your own pictures.Smart ReminderAfter connected to the phone, it will provide synchronous display of message, call or social APP to remind you of important information.More functionsAI Voice assistant, Breath training, Music control, Remote camera, Calculator, Weather, Alarm clock, Stopwatch, Timer, Find phone, Theater mode, etc.Note:* Please read the user manual carefully before use.* There may be 1-3mm error due to manual measurement.* There may be slight difference in color due to shooting angle and light. Please refer to the real object.Parameters:Screen: 1.85" Full-touch ScreenResolution: 240 * 280BT: 5.0Compatibility: Android 4.4 and above or iOS 8.0 and aboveChip: Realtek8762DTMemory: Flash 64MBBattery Capacity: 350mAhWorking Time: 5-7 daysStandby Time: about 20 daysApp: Da FitSpecifications:Model: K55Case Material: Alloy+PlasticStrap Material: SiliconeColor: Black / Jungle Green / Earth Yellow (Optional)Water-Resistant Level: IP67Dial Size: 54 * 44mmDial Thickness: 12mmStrap Width: 22mm, compatible with universal quick-release 22mm strapsItem Weight: 64g / 2.26ozPackage Size: 12.5 * 8.5 * 7cm / 4.92 * 3.35 * 2.76inPackage Weight: 169g / 5.96ozPackage List:1 * Smart Watch1 * Charging Cable1 * User Manual (English, French, German, Italian, Spanish, Japanese)