1. Compatible system: Android 5.0 and above, iOS 9.0 and above 2. Screen: 1.39 inch AMOLED screen, 454x454 resolution, PPI 326 3. Battery capacity: 790mAh 4. Material: metal + plastic 5. Safety protection: 5ATM swimming class waterproof 6. Working time: 25 days max 7. Charging time: about 2 hours 8. Bluetooth: 2.4 GHz, Bluetooth 5.1, support BLE/BR/EDR 9. Support blood oxygen, heart rate and sleep monitoring, 15 professional sport modes + 85 customized sport recording, GPS positioning 10. Size: 48x48x13.6mm 11. Weight: about 45.5g (without watchband) 12. Packing list: - Smart watch x 1 - Charging base x 1 - Charging cable x 1 - User manual x 1