Type S666 Compatibility IOS/Android OS Features "Display: 1.43'' AMOLED HD screen (always-on / power saver / rich color) GPS: high accuracy of distance and pace calculation, GPS movement track Appearance: CNC aluminum alloy middle frame Bluetooth call: more than 20 meters stable call / clear call Encoder: Photoelectric knob encoder Waterproof: IP68 waterproof" Function A variety of theme styles, custom watch faces, step counting, brightness adjustment, long screen mode, raise hand to light up the screen, multi-sport mode, GPS movement track, sleep detection, pressure measurement, female menstrual cycle, heart rate, blood oxygen, breathing training, information push, remote music, remote photography, real-time weather, find mobile phone (connected to mobile phone), alarm clock, timer, stopwatch, do not disturb mode, Bluetooth call, compass, barometer, Alipay, ride code APP Language English, German, Japanese, French, Italian, Spanish, Russian, Portuguese, Chinese Device language English, German, Japanese, French, Italian, Spanish, Russian, Portuguese, Chinese Manual language Chinese, English App Fitbeing Main chip ATS3085S Button 2 physical buttons + photoelectric knob encoder Andiord OS Support Android 9.0 and above IOS OS IOS 13.0 or later Bluetooth BLE 5.3 + BT Heart rate sensor HX3695S Accelerometers ST-LIS2DH12 3-axis accelerometer atmospheric pressure SPL07-003Detachable geomagnetism QMC6308 Product process Aluminum alloy + ABS Weight 28g Screen size 1.43'' Screen resolution 466*466 Screen type AMOLED HD screen TP Glass (Panda Substrate) Waterproof IP68 Length of the strap 260 mm Strap materal silica gel Watch size 45.6*45.6*11.6mm Battery type lithium battery Battery specifications 462428polymer Battery voltage 3.85V Battery capacity 400mAh Battery time Mild: 15 days; typical: 10 days; Severe: 4 days (on always-on) Charging method Magnetic charging Charging time About 2 hours