HT28 1.85 inch Silicone Strap IP68 Waterproof Smart Watch, Support Sleep Monitoring Functions: 1. Basic functions: data, exercise, exercise record, weather, information, women, music, sidebar, stopwatch, timer, alarm, payment code, business card, calendar, calculator, find mobile phone, camera 2. Bluetooth call: connect once 3. Health management: exercise monitoring, sleep monitoring, heart rate detection, breathing exercise 4. Exercise mode: 9 exercise modes on the watch side, massive exercise modes on the APP side 5. Call dialing, common contacts, call records, voice assistant 6. WeChat exercise: synchronize the watch exercise steps to the WeChat ranking list 7. Message and call reminder: phone, SMS, WeChat, QQ, WhatsApp, Line Facebook, Facebook messenger, Kaokao, Twitter, Skype 8. Firmware upgrade: The watch firmware can be upgraded over the air through the APP Parameters: 1. CPU: Realtek8763EWE 2. RAM: 480KB 3. ROM: 640KB 4. External Flash: External 128Mb 5. Heart rate chip: HX3918 6. Accelerometer: STK8321 7. Bluetooth: BLE5.0 8. Display: 1.85-inch 360x360 IPS display 9. Physical buttons: 2 10. Touch: full-screen touch 11. Flashlight, laser pen, compass 12. Battery: 450mAh polymer battery 13. Charging method: magnetic charging 14. Built-in dial: 5 built-in dials, support custom dials, support dial downloads 15. Size: 58.8x53.8x13.2mm (circle diameter 52.5mm) 16. Case material: zinc alloy 17. Strap specifications: 22mm silicone strap (removable and replaceable) 18. Weight: 75g 19. Waterproof level: IP68 20. Battery life: 5-7 days (depending on the usage scenario) 21. Charging time: less than or equal to 2H 22. Supported systems: Android 5.1 or iOS8.2 or above systems that support Bluetooth 5.0 BLE 23. APP name: FitCloudPro 24. Watch firmware language: Simplified Chinese, Traditional Chinese, English, German, Russian, Spanish, Portuguese, French, Japanese, Arabic, Dutch, Italian, Czech, Greek, Hebrew, Indonesian, Malay, Polish, Thai, Vietnam