QS66 1.83-inch Smart Watch, Support BT Call, Heart Rate, Blood Oxygen 1. Heart Rate: Tianyi He Core HX3917 2. G-Sensor: STK8321 3. Flash memory: 128MB 4. Screen Size: 1.83 inch 5. Resolution: 240 x 284 enhanced high color gamut 6. Control Mode: Full touch screen 7. Charging time: 4-5 hours 8. Life time: 28 days 9. Waterproof Level: IP68 10. Chipset: AB5691 11. Compatible System: Android 5.0 or above iOS 9.0 or above 12. BT: BT 5.3 13. Charge Mode: Magnetic charging 14. Capacity: 3.8V1000mAh 15. Size: 49.3 x 39 x 11.5mm 16. Weight: 45g 17. Appearance material: Zinc alloy 18. Wristband size: The length is 255mm and the width is 22mm 19. APP Language: Chinese, English, Russian, Arabic, Vietnamese, Danish, Thai, Polish, Persian, Spanish, Malay, Greek, French, Italian, German, Portuguese, Türkiye, Latin, Romania, Hebrew, Burmese, Ukrainian 20. Wisebrave Watch Language: Chinese, English, Russian, Arabic, Vietnamese, Danish, Thai, Polish, Persian, Spanish, Malay, Greek, French, Italian, German, Portuguese, Türkiye, Latin, Romania, Hebrew, Burmese, Ukrainian 21. Software features: Dial market, QR code connection, multiple UI menus, voice calls, OTA upgrade, step counting, calorie tracking, sports modes, lift-to-wake screen, sleep monitoring, incoming call reminder, message notification, sedentary reminder, alarm clock reminder, stopwatch, dial switching, 3D dynamic dial, music playback, breathing training, hourly measurement, heart rate, blood pressure , blood oxygen level measurement, calculator, custom dial design, brightness adjustment, weather forecast, independent alarm clock, sports trajectory, games and other new features. Swipe left on the dial desktop: Switch to the first-level menu; swipe right to access the quick menu. Swipe up for message interface; swipe down for Bluetooth call switch settings,brightness adjustment,power saving mode and do not disturb mode. Voice assistant.