Function 1. Time display function, display hour, minute, second, month, day, week, 12/24H, the initial value is (2020-1-01 12:00 00 WED) 2. Alarm function 3. Countdown function, the initial value of (0:00.00, 12:00 (0FF) 4. Stopwatch function, the initial value is (0 :00'000, (0FF) 5. Step count, exercise time, pace, mileage, calorie consumption 6. Altitude, relative altitude 7. Air pressure curve , air pressure, air pressure curve view (24H) 8. Exercise time record, movement relative height view. 9. Diving mode, NDL time, depth, temperature , diving speed. 10. Free diving mode 11. Dive log (99 records) 12. Compass calibration function 13. Low power reminder 14 Backlight function 15. 4 key functions 16. Use CR2450 battery Q4: Why is it 100M waterproof, but only 50M dive? br> A4: Aqua is 100M waterproof, it can dive 100M, but the maximum depth the watch can display is 50M, and the watch below 50M does not display the diving depth Note: all DIVING Before diving, we must establish the safety factor and oxygen content. 1. CONS (Conservative) 2. STANDARD (Standard) 3. AGGR (non-conservative) CONS level can be shortest decompression time, AGGR level can be longest decompression time DIVE MODE Angle compass reading --- 359 Dive depth in M/FT --- 18.8m Dive/surface speed --- 10m/minutes NDL TIME --- 160 minutes Current time --- 5:06 Current temperature --- 18.8 F Altimeter and barometer Altitude --- 1033 M Air pressure chart air Current air pressure--1003hpa