The Heritor Automatic Jonas includes the following features - 316l surgical-quality stainless steel case, automatic movement , jewel bearings - 20 jewels, 36 hour power reserve, beats per hour (bph) - 21600/hour, sapphire-coated mineral crystal, skeleton dial, observation caseback to view movement, genuine leather strap , logo-engraved stainless steel clasp, luminous hands, luminous markers, 43mm diameter, 10 ATM water resistance.