LED Military cool waterproof noctilucent plane design digital watch for boys Size M Watch band material: silica gel. Case material: alloy. Size M: 4*4.6cm. Suitable for students 14-18 years. Water resist: 50M (do not press button under water.) Features: week, calendar, alarm clock, back light, stop watch, 24H time format Colorful back light. Exquisite packaging box