I purchased this but have not used it. The built-in battery is a monitor battery for checking the operation and needs to be replaced as it is dead. Product Number: SWAG12S [Authentic Overseas Product] Size: (Approx.) H39 x W39 x D11mm (excluding lugs and crown) Maximum wrist size (approx.) 19cm, Minimum wrist size (approx.) 14cm, Belt width (near lugs) (approx.) 19mm, Belt width (near buckle) (approx.) 19mm Weight: 55g Price: 13,650 yen