Diameter: 43mm Thickness: 10mm Strap Width:19mm Mechanical Waterproof IP68 Screen size 1.28" Screen type TFT-LCD, color screen Screen cover Tempered glass Strap material TPU hardness 70 degrees Buckle TPU hardness 85 degrees Tongue buckle Stainless Steel Hardware MCU Realtek8762CK, 160Kb RAM+128Mb ROM IMU (acceleration + gyroscope) STK8321 PPG heart rate sensor VC11 Screen Resolution 240*240 BLE BLE5.0 BLE antenna module Wire Power Operating Voltage 3.7V Battery capacity 210mAh Battery type Lithium polymer battery Charging method Magneto-suction charging Charging time ? 2.5 hours APP OS iOS iOS 9.0+ Android Android5.0+ Function Multi-language support 9 languages(China, English, German, Japanese, Spanish, Italian, French, Portuguese, Russian) Basic functions Clock, date display (12/24 hour system, default 12 hour system) Multi-dial OTA upgrade (Upgrade directly via the BLE connection app) Daily activity monitoring Heart rate (24-hour real-time heart rate monitoring) Sleep (excluding short break): falling sleep time, wake up time, total sleep time.) Steps (Monitor the number of steps per minute and record it every 10 minutes) Calorie (Monitor calories per minute and record it every 10 minutes) Distance (Monitor the distance per minute and record it every 10 minutes) Sports functions walking (Exercise time, energy consumption, heart rate, pace, speed, steps, distance) running (Exercise time, energy consumption, heart rate, pace, speed, steps, distance) riding (Exercise time, energy consumption, heart rate, [ App launches the movement display: pace, speed, distance]) Climbing (Exercise time, energy expenditure, heart rate) Yoga ( Exercise time, energy consumption) Basketball (Exercise time, energy expenditure, heart rate) Football (Exercise time, energy expenditure, heart rate) Table tennis ( Exercise time, energy expenditure, heart rate ) Badminton (Exercise time, energy expenditure, heart rate ) Autonomous measurement Heart rate measurement (User self-measurement, single heart rate monitoring) Notifications Calling Notification (Incoming call received, an alert is displayed; You can hung it up by watch.) Stand-up reminder (This reminder appears when the user is sedentary more than an hour, reminding the user to stand up and do some exercise.) SMS notification (The phone receives SMS message push anddisplay it to watch.) App notification (Push notifications from other apps in watch by your choice) Alarm reminder Target reaching reminder (Show this alert when the sport goal is reached) Low battery reminder (Show this alert when the battery power is low) Heart rate too high alert (Show this alert when the heart rate is too high) Other functions Stopwatch (The stopwatch is accurate to the nearest second (eg 59:59.99)) Timer (The timer can be set up to 23 hours, 59 minutes and 59 seconds.) Firmware information (View device related information (firmware version, BLE address, etc.)) Sports record Reset function Music control (Control your smartphone to play music.) Gesture Lift the wrist (Lift the wrist to automatically brighten) lay down (Put down the automatic shut down screen)