(It works with smart phones, making it more convenient) Operating System Support: Android 6.0 or later (models with Bluetooth only). *Cursor key type feature phone (galaho) not supported; iOS (Apple) iOS 11 or later (Route Log Function) Automatically records the altitude acquired by your smartphone and the routes obtained by your smartphones GPS. It is also possible to plot altitude points obtained by manual operation. Calories Burned Display: Calculates and displays calories burned by adding the elevation element and records as an activity log. Location Indicator: By using the button on the clock beforehand, recording your current location (location point) on the app, the direction of the clock will be displayed on the LCD with the second hand of the watch. [Mode/Display Switching Customization Function] You can set the mode to display on the clock on the app, and change the order. You can customize the desired functions and change the order to display the frequently used functions first, etc. Similarly, you can customize the contents that you display on the LCD screen with a basic watch. Automatic Altitude Correction Function: If your smartphone acquires altitude information 4 times a day, it automatically corrects the altimeter of the watch. Automatic Time Correction: Automatically connect to your smartphone 4 times a day to correct home time and world time. When moving beyond time zone, one push will show accurate local time. ■ Accurate Time System (Accurate Time System) Based on time server (UTC) and location information obtained through a smartphone to correct the time zone and daylight savings time information. 300 Cities World Time: The world time setting can be easily set on your smartphone. The time of the selected city is displayed in the dial from the world map/city list that covers over 300 cities. [Find your Cellphone] Press the button on the watch to make the sound of your smartphone and notify you of your location.