C21 1.32 inch HD Screen Smart Watch, Support Heart Rate MonitoringBlood Oxygen Monitoring 1. Main control platform: 8762DK 2. Memory: 128M 3. Display: 1.32-inch high-definition square screen, 360*360 resolution 4. Bluetooth: BT3.0 5.0 5. Communication systemdata transmission: 8762DK+Jerry 6. Heart rate: HRS3605 7. Pedometer: Silan Micro SC7A20 8. Charging method: 2PIN magnetic wire 9. Battery: capacity 300mAH (polymer pure cobalt battery) 10. Waterproof grade: IP67 11. Compatible system: Android 6.0 and above; iOS 10.0 and above 12. Watch menu language: Simplified Chinese, Traditional Chinese, English, German, Russian, Spanish, Portuguese, French, Japanese, Arabic, Italian, Korean (factory default English) 13. FitCloud Pro APP language: Simplified Chinese, Traditional Chinese, English, German, Russian, Spanish, Portuguese, French, Japanese, Arabic, Italian, Korean, Ukrainian, Croatian, Hungarian, Hindi English, Turkish, Greek, Czech, Slovak, Polish, Persian, Thai, Swedish, Finnish, Dutch, Albanian (27 countries) 14. Functions: dialing, common contacts, call records, voice assistants, data, exercise, exercise records, heart rate monitoring, sleep monitoring, blood pressure monitoring, blood oxygen monitoring, information, weather, female menstrual cycle reminders, music, stopwatch, timing device, alarm clock, find phone, settings, message, do not disturb mode, brightness adjustment, mute, language, password, QR code, split screen, 19 sports modes, message and call reminder, WeChat sports, weather, etc. 15. Dimensions: 46.5x13mm 16. Strap: TPU strap, 22mm width, total strap length 264mm, adjustable area 160-250mm 17. Net weight: 51.3 grams