1.45 inch Silicone Band IP68 Waterproof 1. Basic functions: Alipay offline payment, smart NFC, smart split-screen display, custom dial, vibrato control, drainage function, charging night light mode, wiress charging, shortcut key customization, payment code, language setting, alarm clock, Bluetooth calls, call reminders, message reminders, call records, Bluetooth music, sedentary reminders, alarm clock reminders, heart rate detection, blood pressure detection, blood oxygen detection, sleep detection, exercise step counting, calories burned, exercise distance, multi-sport mode, menu Style switching, screen bright time setting, screen brightness adjustable, vibration intensity adjustable, wallet function, motion track view, pword lock, raise your hand to brighten the screen, calculator, find phone, stopwatch, voice istant, breathing training, 5-day weather Display, do not disturb mode, remote camera 2. Main control chip: Realtek 3. Call Bluetooth: BK 32664. Screen specification: 1.45 inches, resolution 412x 4125. Microphone: Support 6. Physical keys: 3, switch key, encoder, function key 7. Battery capacity: 300mah 8. Charging time: 3-5 hours 9. Watch memory: RAM: 192KB ROM: 128Mb 10. Bluetooth version: 3.0 and 5.1 BLE dual mode 11. Touch: TP G+F full fit 12. Charging method: wiress charging 13. Waterproof grade: IP 6814. Standby time: 20 days+ 15. Use time: about 5 days 16. System requirements: Android5.0+ /iOS 10.0+ 17. OTA upgrade: support 18. Information push: , , , QQ, WeChat, etc. 19. Supported languages: Simplified Chinese, English, Spanish, German, Italian, French, Japanese, Hungarian, Russian