Functional Explanation 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. The adjustable length stainless steel band provides 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. Dual time, analog dial and digital dial to display different times separately. 12H/24H, 12 hours standard time and 24 hours complete time. Product Material Case Material: Stainless Steel Band Material: Stainless Steel Crystal Material: Hardlex Buckle Material: Stainless Steel Back Cover Material: Stainless Steel Battery: CR2 Size Information Total Length: Adjustable Dial Diameter: 48mm Band Width: 24mm Dial Thickness: 14mm Wear Perimeter: Adjustable Weight: 170g Product Feature 12H/24H EL Backlight Stopwatch Calendar Week Three Time Alarm Package Contains Watches * 1 Watches English Instruction * 1 TIP Please don't press any button in the water.