Product Dial: square Strap material: TPU Watch length: 250mm Screen size: 1.3"TFT-LCD Screen cover: 2.5D high hardness glass Touch screen: full screen touch Physical button: 1 Waterproof rating: IP68 MCU Nordic nRF52840 BLE 5.0 (256KB RAM, 1MB Flash, 64MHz main frequency, support USB2.0) Accelerometer sensor: STK8321 Heart rate sensor: HX3600 Flash memory: 64Mb Vibration motor: button motor Bluetooth connection: BLE4.2 can support BLE5.0 APP OS iOS iOS: 8.0 and above Android Android: 4.4 and above Power Rated voltage: 3.8V Maximum battery power: 0.24 watts Battery capacity: 210mAh Battery type: polymer lithium battery Charging interface: contact type Charging method: magnetic charging (with USB charging cable + charging pin) contact charging (2 electrode points) Charging time: about 2.5 hours Life time: about 10 days Standby time: 45 days Function Multi-language support: 6 languages Chinese, English, German, Russian, Japanese, Korean Step counting monitoring function: support Heart rate monitoring: 10*24h heart rate monitoring includes dynamic heart rate Sleep monitoring: support (display sleep data on the APP side) (deep sleep, light sleep, wakefulness) Calorie monitoring: support (displayed on the watch and APP) Data can be viewed on the watch: steps, calories, speed, distance, active time You can view in the watch: exercise calendar, save the last 50 exercise records Multi-sports mode: The watch has 8 built-in sports modes (9 in total), APP can choose walking, running, hiking, cycling, treadmill, fitness, mountaineering, spinning, yoga 1-8 default built-in Daily goal: Support-set distance, calories, steps on the APP Incoming call reminder: support to hang up Information reminder: The watch has an information bar Sedentary reminder: support (customizable reminder time interval) Alarm reminder: Alarm preset (getting up, taking medicine, going to work, etc.)off. After the alarm reminding, there are related reminder icons (getting up, taking medicine, going to work, etc.) Stopwatch, timer support Music control: Support open music app, start, pause, previous and next song Find a phone: support Breath training: support (adjust the user's breathing rhythm, relax the mood)Shutdown, restart support: the watch can be operated to shut downTime and date display: The time and date interface needs to display the number of steps, calories, and power. Support 12 and 24 hour systems