Auspicious beginning&reg; LED Personalized creative waterproof noctilucent airplane black digital watch Size M Watch band material: silica gel. Clasp: buckle Size M: 4*4.6cm. Size M is 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