■ Product Specifications Drive Method: Battery Operated Quartz Caliber No: S058 Case Material: Plastic Case Glass Material: Acrylic Glass Waterproof: Reinforced water resistance for everyday use (5 ATM); Battery Life: Approx. 3 year Size: Thickness 0.9 inches (23.4 mm); Weight: 2.6 oz (71 g); Comes with an interior lighting function that makes it easy to check even in dark places such as indoor or gymnasiums.