Children Sports Waterproof Digital Watch1. Mirror material: plexiglass mirror2. Buckle material: stainless steel3. Strap material: PU4. Case material: plastic5. Clasp style: pin buckle6. Crown type: on7. Table bottom type: ordinary8. Dial shape: round9. Movement type: electronic10. Display type: number11. Waterproof performance: 30 meters12. Special functions: week display, month display, luminous, stopwatch timing, alarm clock, houy hour, 12/24 hour system13. The total length of the watch: 245 mm for large size and 230 mm for small size14. Dial thickness: large 16.99 mm, small 16.02 mm15. Strap width: large 18 mm, small 16 mm16. Strap thickness: large 1.8 mm, small 1.2 mm17. Dial width: large 43.49 mm, small 38.62 mm18. Weight: 37.1 grams for large size, 29.7 grams for small size