The Casio G-Shock Master or G GW-3000M-4AER is a shock-resistant men's watch that works on light energy. Thanks to the automatic calibration, the position of the hands is checked and corrected every hour. So you always know exactly what time it is, even if the hands are staggered by magnetism or shock. On the G-Shock you can set up to 29 different time zones. In addition to the time and the 24-hour indication, you also read the date and use the watch as a stopwatch. The watch is 20 bar waterproof, so you wear it while swimming.