The ideal first watch for children age 4+. The clear face design and simple teaching method make it really easy for children to learn to tell the time. Worn every day, your child will be able to practice their new skill wherever they go. Our watches have a 33 mm diameter case. They are water resistant and can withstand splashing, but not total immersion. The washable nylon strap fits wrists from 12 cm to 18 cm (child to adult).