Casio Men's GW800-1VCF G-Shock Atomic Multi-Band Watch Quartz movement Protective mineral crystal protects watch from scratches Case diameter: 51.5 mm Auto EL backlight; countdown timer; 4 daily alarms; 1/100 sec. stopwatch; 29 time zones (48 cities), 12 and 24 hour formats Water resistant to 660 feet (200 M): suitable for recreational scuba diving