Functional Explanation Use 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. Leather band provide comfortable wear. Alarm, provide timed alarms. Week and date, follow the time to automatically update. 1 / 100 standard stopwatch. 12H/24H, 12 hours standard time and 24 hours complete time. Three time, analog dial and digital dial show different times separately. Product Material Case Material: Stainless Steel Band Material: Leather Crystal Material: Glass Buckle Material: Stainless Steel Back Cover: Stainless Steel Battery: CR2 Size Information Total Length: 265mm Dial Diameter: 51mm Dial Thickness: 15mm Band Width: 24mm Perimeter: 245mm~180mm Weight: 123g Product Feature 12H/24H EL Backlight Stopwatch Calendar Week Three Time ( Digital-Analog ) Alarm Package Contains Watches * 1 Watches English Instruction * 1 TIP Please don't press any button underwater.