System Requirement: iOS 11.0 + or Android 9.0 + BT: v5.3 Display technology: AMOLED, Size: 1.96' Resolution: 410*502 Cloud-based watch faces: Yes Heart rate sensor: Yes Accelerometer: Yes SpO2 sensor: Yes Typical Usage Time: Up to 7 days Standby Time: Up to 30 days Charging Time: Up to 2 hours Charging Cable: Yes Watch Case Material: Metal Strap Size & Material: 22mm Water Resistance Rating: IP68 Heart rate monitor SpO2 monitor Step tracker Activity history Sleep monitor Breathe practice Stress measurement Female cycle tracker Sports modes SoS technology Caller name information Call rejection Stopwatch Timer Alarm Reminder Weather Vibration alert Do not disturb mode Screen brightness Functional crown Wrist awake