Product Parameters: 1. Model: G51 2. Dimensions: 46.5*11.6mm 3. Case Material: aluminum alloy 4. Strap Material: silicone 5. Screen: round screen 6. Screen size: 1.28inch 7. Resolution: 240*240 8. Chip: is2806 9. Heart Sensor: SC7R31 10. G-sensor: SC7A20 11. External Flash: 64M 12. External SD: 4GB 13. Bluetooth: 5.0 14. Battery Capacity: 300mAh 15. Charging Way: magnetic charging 16. Standby Time: 40 17. Waterproof: IP67 18.System requirements:Android 4.4 and above/IOS 8.4 and above APP:V Band Features: 1. Keep an eye on your health: Heart rate/blood pressure/blood oxygen monitoring, sleep tracker, sedentary reminder, water reminder. 2. A good helper for workout: Pedometer, calories burned/distance, map running routes, sports modes. 3. A good helper for daily life: 4GB memory for music, play music stored on the watch, connect to Bluetooth earphones. Make Bluetooth phone calls, sync contacts / call logs / notifications (incoming calls, message, social media, and so on), clock, raise wrist to wake watch, weather, alarm, camera remote, o recorder, find my phone, DND mode, multiple watch faces, custom faces, etc. Languages: UI languages: English, Chinese (simplified/traditional), Japanese, German, French, Spanish, Portuguese, Russian, Italian, Thai, Polish, Malay, Vietnamese, Turkish, Dutch, Greek, Arabic. App languages: Chinese (simplified/traditional), English, Japanese, French, German, Russian, Korean, Greek, Italian, Portuguese, Arabic, Spanish, Persian, Thai, Turkish, Vietnamese.