DT102 1.9-Inch Heart RateBlood Oxygen Monitoring Bluetooth Call Watch With NFC Function 1. APP: Wearpro 2. Chip: Realtek RTL8762DK 3. Heart rate sensor: Tianyi Hexin HX3605 4. Bluetooth: Dual Bluetooth 5.0 5. Screen size: 1.9-inch square screen 6. Screen resolution: 240 x 283 7. Screen type: IPS full-view color screen 8. Compatible systems: supports Android 4.4 and above, IOS 10.0 and above 9. Functions: Breathing training, dial push, stopwatch, brightness adjustment, multi-sport mode, sleep, heart rate, information, music control, remote photography, weather, find mobile phone (used by connecting to mobile phone), Bluetooth calling, Bluetooth music playback, password protection , calculator, split-screen display, shortcut widget, weather, female assistant, massager, Alipay, voice assistant, my QR code 10. APP supports languages: Chinese, Traditional Chinese, English, Korean, German, Spanish, Japanese, French, Italian, Russian, Portuguese, Arabic, Ukrainian, Thai 11. Device support languages: English, Chinese, Traditional Chinese, Danish, Greek, Latin, Romanian, Turkish, Hebrew, Czech, Polish, Spanish, German, Russian, Portuguese, French, Japanese, Italian Chinese, Vietnamese, Korean, Arabic, Persian 12. Battery model: 521726 polymer 13. Battery voltage: 3.7V 14. Battery capacity: 260mAh 15. Battery life: 5-7 days of normal connected use, 15-25 days of standby (connected use depends on personal usage) 16. Charging method: wireless charging 17. Charging time: about 3 hours 18. Operation mode: touch + button 19. Waterproof level: IP68 20. Total length of wristband: 248mm 21. Strap width: 20mm 22. Watch size: 44 x 38 x 11mm 23. Net weight: 35 grams