Function 1. Time display function, display time, minute, second, month, day,week, 12/24H, initial value is2020-1-01 12:00 00 WED 2. Alarm function3. Countdown function, the initial value of (0:00.00,12:00(0FF)4. Stopwatch function, the initial value is (0:00000, (0FF)5. Step counting, exercise time, pace, mileage, calories consumption6. Altitude, relative altitude7. Air preure curve, air preure, air preure curve view (24H)8. Exercise time record, movement relative height view.9. Scuba diving Mode, NDL time, depth,Temperature,diving speed.10.Free diving Mode11. Diving log (99 records)12. Compa calibration function13. Low-power reminder14. Backlight function15. 4 key functions16. Use the Battery CR2450 1. Waterproof 100M 2. Scuba Dive 3. NDL Time4. Safety Factor 5. Nitrox 6. Free Dive 7. Compa8. Altimeter 9. Barometer 10. Thermometer11. World-time 12. Date&Time 13. Stopwatch14. Countdown 15. Alarm 16. Back Light SCUBA DIVE Before scuba dive we need to set safety factor and oxygen content1. CONS (Conservative)2. NORM (Standard)3. AGGR ( Non-conservative)CONS level can be the shortest decompreion COMPASS CALIBRATION Before scuba SCUBA DIVING MODE Compa angle---359Diving depth in M/FT---18.8mDive/Surface speed---10m/minutesNDL TIME--- 160 minutesCurrent time---5:06Current temperature---18.8 F Altimeter & Barometer Altitude---1033 MAir preure chartCurrent air preure--1003hpa COMPASS MODE 1. The upper area shows the week and current time2. Display the azimuth angle in the middle area3. Display the position on the lower area LUMINOUS DISPLAY Still Clearly visible in extremely dark environment Material GLASS: tough, scratch-resistant gla, high light transmiionWATCH CASE : 316L stainle steel corrosion resistance Maintenance 1. Storage: please place the product in a cool place, do not place indangerous environment, extrusion, preure, high temperature, lowtemperature, high humidity, easy to fall, hard hit, etc. .2. Do not remove the watchcase by yourself3. After use: especially after use under water or sea water, be sure touse clean water to soak and rinse. The cleaning method is:remove the watch from the hand, gently grasp the strap and placethe entire product in the water.Soak in water for about three to five minutes, then shake gently.Let the water flow into the slit to clean the salt.If there are obvious stains, gently rub with your hands.Do Not Bang in the Water.Do not use a strong water column.Do not use any cleaning solvent other than water.After cleaning, put it back on your hand or put it in a cool place.