This watch is interchangeable with 20mm straps</br>Durable mineral crystal protects watch from scratches</br>Quartz Movement</br>Case Diameter: 40mm</br>Water resistant to 50m (165ft: in general, suitable for short periods of recreational swimming, but not diving or snorkeling</br><br/>http://www.amazon.com/gp/product/B01M8O2DCX