K9 Ultra Pro 1.39 inch Silicone Band IP67 Waterproof Smart Watch Support Bluetooth Call NFC 1. Functions: Alipay, NFC, custom dial switching (support APP push), 4 UI interface switching, phone book, Bluetooth dial-up calls, health monitoring (heart rate, blood oxygen, blood pressure, sleep), data tracking (step counting, distance, calories), multiple sports modes (walking, cycling, running, football, volleyball, tennis, breathing training, basketball, etc.; APP supports 100+ modes), reminders (information, sedentary, drinking water, alarm clock), weather, WeChat sports, music control, women's health, breathing training, remote photo taking, stopwatch, find phone and bracelet, intelligent voice assistant Siri, wrist raise to wake screen, frequently used contacts, split screen (sidebar), flashlight, calendar, shortcut bar (control center), business card (friends), calculator, button with encoder; application notification reminders: SMS, incoming call, WeChat, QQ, Facebook, Twitter, Line, WhatsApp, Instagram 2. Language system: Simplified Chinese, English, Russian, Spanish, German, Italian, French, Portuguese, Turkish, Hebrew, Arabic, Vietnamese, Traditional Chinese, Thai 3. Product screen: 1.39 inch TFT 4. Resolution: 360x360 5. Working hours: 5-7 days 6. Standby time: more than 15 days 7. Storage: 128MB 8. Bluetooth version/chip: Bluetooth 5.2 RTL8763WEW 9. Material: zinc alloy + IML + silicone strap 10. Touch mode: full screen touch 11. Call duration: 6 hours 12. Charging time: 2 hours 13. Battery: 250mAh 14. Compatible system: iOS 10.0 and Android 5.0 or above 15. Interface: wireless charging