Casio G-Shock GAC-100GW Watch - WHITE Imported Shock Resistant , 200 Meter Water Resistant, Magnetic Resistant Neo-brite Luminous Hands, 1/20 second chronograph Accuracy: +/- 20 seconds per month Battery: SR927SW, Approx. battery life: 3 years Module 5277, Size of case/total weight: 55.0 x 52.7 x 16.6mm / 72.9g