1. DIMENSIONS: HWL-10 inch x 10 inch x 1.5 inch (25 x 25 x 3.8 cm). Requiring one AA battery (not included) when using. Modern style, light and elegant, a nice addition to the wall, keeps a perfect time. 2. MATERIAL: Kids friendly, the outer ring is made of wood-colored plastic, not solid wood. The acrylic face makes it water and dust resistant, shatterproof. The rainbow color numbers clearly marked inside are specifically designed for children, available for early childhood initiation.