Propeller Movement: Japanese Automatic Miyota Caliber 9015. Power Reserve of 42 Hours. 28800vph. 24 Jewels. Open Heart Movement: Japanese Automatic Miyota 90S5. Power Reserve of 42 Hours. 28800vph. 24 Jewels. 48mm x 22.30mm Reversible Black PVD 316L Stainless Steel Case. K1 Gorilla Glass on Both Sides. Push Pull Crown. Grey PVD Uni-Directional Rotating Bezel. Side One: Propellor Design. Stainless Steel Hands with Luminous Filling. Date Window at 4 O'Clock. Side Two: Black Dial. Stainless Steel Hands and Hour Markers with Coloured Luminous Filling. 30/24mm x 18cm Grey FKM Silicone Anallergenic Strap with Stainless Steel 316L Buckle. Water Resistant to 100 Meters 10ATM. The ÔReverseÕ system allows the case to be inverted fully in both directions. A quick-release button releases the crown from its protection by rotating the crown protector. Two special arms allow the case to rotate freely, and a clearly recognisable click tells you when the case is in the correct position to be locked back into place.