Parameters: Material: zinc alloy, glass, silica gel Band Length: 165mm-255mm Band Width: 22mm Dial Height: 50mm Dial Width: 47mm Dial Thickness: 13.5mm Display size: 1.3 inches Screen resolution: 240*240 Connection mode: Bluetooth connection Compatible systems: Android 4.4 or above, iOS 8.2 or above Message reminding mode: vibration Main functions: ECG measurement, infrared blood oxygen measurement, sleep apnea monitoring (snoring monitoring), respiratory training, heart rate monitoring, 10 kinds of exercise patterns, female menstrual ovulation reminder, temperature measurement, alarm clock, information reminder, call rejection reminder, mobile phone music control, stopwatch function, multi-dial switching, sedentary reminder. Watch language support: Chinese, English, Japanese, French, German, Italy, Spain, Russia, Portugal Language: Chinese, Traditional, English, Japanese, German, Russian, Italian, French, Spanish, Portuguese, Vietnamese, Korean, Persian (Arabic) Menu: Exercise, step counting, sleep, heart rate, ECG, blood oxygen, body temperature, weather, respiratory training, notification, alarm clock, stopwatch, timer, looking for mobile phone, female, camera, settings Charging time: 2-3 hours Packing list: Smart watch x1 Magnetic charging line x1 Instruction x1