K56 Pro 1.39 inch Smart Steel Strap Wristband Support Heart Rate Monitoring Blood Pressure Monitoring 1. Functions: Custom dial, Bluetooth callBluetooth music (ultra-clear sound quality), weather display, heart rate detection, blood pressure detection, blood oxygen detection, all-day heart rate detection, time display, step counting, calories, distance, heart rate, blood pressure , blood oxygen, sleep time, onoff display, stopwatch, multi-sport mode, sleep monitoring (sleep time, sleep quality), electric notification, information reminder, multi-language push, alarm clock reminder, remote camera, sedentary reminder 2. Screen size: 1.39 inch IPS square screen with full viewing angle 3. System requirements: Android 4.4 and above, IOS 8.0 and above, support Bluetooth 5.0 4. Bluetooth version: BLE 5.0 5. Main control chip: Ruiyu 8762DK 6. Memory: 128MB 7. Screen resolution: 360x360 8. Heart rate chip: 3605 9. Speaker chip: 0916 10. Battery capacity: 400mAh large battery, standby time: about 30 days 11. Working time: about 5-10 days 12. Supported languages: English, Chinese, Japanese, German, French, Spanish, Arabic, Russian, Ukrainian, Russian, Portuguese Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.