Functional Explanation 50M/5ATM waterproof, you can wear it to swim or bathe, but please don't press any button in water. High quality movement, provide precise time and keep, the service life of the at least 2 years. EL backlight clearly display time in the dark, automatically shut down after 5 seconds. Soft rubber band provide comfortable wear. Alarm, provide timed alarms, an alarm will sound when the scheduled time arrives. Week and date, follow the time to automatically update. 1 / 100 standard stopwatch. 12H/24H, 12 hours standard time and 24 hours complete time. Product Material Case Material: Plastic+Rubber Band Material: Rubber Crystal Material: Resin Buckle Material: Stainless Steel Battery: CR2 Size Information Total Length: 250mm Dial Diameter: 44mm Band Width: 20mm Dial Thickness: 12mm Maximum Perimeter: 220mm Minimum Perimeter: 165mm Weight: 80g Product Feature 12H/24H EL Backlight Stopwatch Calendar Week 50M Waterproof Alarm Package Contains Watches * 1 Watches English Instruction * 1 TIP Please don't press any button in the water.