This is a military watch that emphasizes design and functionality. The battery is already installed in the watch, so you can use it immediately. It has a full range of functions, including a stopwatch, outdoor light, alarm, and water resistance! *The water resistance is for daily use only; please do not submerge it in water for extended periods. This versatile wristwatch can be widely used for fashion, outdoor activities, survival games, and more. 【Size】 Face: Approximately 4.5cm (H) x 5cm (W) Band width: Approximately 2.5cm Band length: Approximately 24cm Thickness: 0.9mm Weight: 61g Total belt length: 24cm Material: Rubber There are 7 holes in the belt, making it suitable for both men and women. ・Backlight can be selected from 5 colors ・Time display mode ・Month, day, and week display ・Stopwatch ・Alarm ・Alarm ・12-hour/24-hour display ・30m water resistance ・Operating temperature -30℃～50℃