1. Time display function, display hour, minute, second, month, day, week, 12/24h, the initial value is (12:00 00, sa 1-1) 2. Clock function 3. Countdown function, the initial value is (0:00.00, 12:00 (0ff) 4. Stopwatch function, the initial value is (0:00 00 00 0, (0ff) 5. Step count , exercise time, pace, mileage, calorie calculation 6. Altitude, relative altitude 7. Air pressure change curve, air pressure, air pressure graph (24h) 8. Record exercise time exercise, see the exercise relative height 9. Diving function, one is diving, the other is free diving Diving with NDL time, deep diving, water Temperature, diving speed 10. Can store 99 dive logs 11. Compass correction function 12. Low battery reminder function 13. Backlight function (backlight is always on during diving) 14. 4 button functions 15. Use u no CR2450 battery Screen material: tempered glass How to use: wristband Compatible system: fully compatible Communication function: support Menu language: English Additional function: altitude pressure compass Wireless distance: no Battery capacity: 220mAh Mode of operation: button Product size: 48mm Strap material: rubber Product weight: 64 (g) Packing list: watch + manual + warranty card Strap style: sport Strap size: m / l (suitable for to wrist circumference 150-200 mm) Features: waterproof