Size One size fits all . Wrist circumference: (approx.) 13.5-18cm. Dial: (approx.) W2.9cm x H2.9cm. Overall dimensions: (approx.) W3.6cm x H21.8cm x D0.8cm. Belt width: (approx.) 1.3cm. Outer box: (approx.) W8.8cm x H6cm x D10cm Material Alloy, synthetic leather, stainless steel, mineral glass Detail Water resistance for daily use: None Compatible battery: SR626SW