Fangrui Product Details 1. Rogbid Tank S2 1.83 Inch Ips Screen Smart Watch, Support Bluetooth Calling Blood Pressure Sleep Monitoring 2. Support Bluetooth Calls, Heart Rate Detection, Blood Oxygen Detection, Blood Pressure Detection, Time Display, Step Counting, Calories, Distance, Heart Rate, Multiple Sports Modes (more Than 100 Modes), Sleep Monitoring (sleep Time, Sleep Quality), Incoming Calls Notification, Information Reminder, Multi-language Push, Task Reminder (sedentary Reminder), Music Control, Sync Data To Apkapp 3. System Requirements: Android 5.0 And Above, Ios 10.0 And Above 4. Bracelet Supports Languages: Chinese, Czech, English, German, Polish, Spanish, Japanese, French, Russian, Arabic, Ukrainian, Italian, Portuguese 5. Push Support Languages: Chinese, Czech, English, German, Polish, Spanish, Japanese, French, Russian, Arabic, Ukrainian, Italian, Portuguese 6. Main Control (cpu): Rtl8763ewe 7. Memory (ram+rom): Ram256kb+rom192kb, External Expansion 128mb Flash 8. Screen Display: Lcd 1.83-inch Ips Screen, Resolution: 240x284 9. Display Brightness: More Than 400 Lumens 10. Touch Screen: G+f Process 11. Material: Zinc Alloy Surface Case + Pc Bottom Case + Tpu Strap 12. Bluetooth Version: Bluetooth 5.0 13. Battery Capacity: Polymer Lithium Battery 450mah 14. Standby Time: 45 Days 15. Working Time: About 10 Days 16. Charging Time: 3h 17. Heart Rate Sensor: Hx3605 18. Charging Cable: Charging With Magnetic Suction Cable, With Patch Protection Ic= 19. Speaker: 1508 Waterproof Speaker 20. Microphone: Tmg4015fs-w38 Waterproof Microphone 21. Waterproof Grade: Ip68 22. Power Supply: Charging 1a Or Below 1a 23. App: Da Fit 24. Size: 50.9x39.6x13.2mm 25. Weight: 66.5g