Drive system: Battery-powered quartz Caliber No.: VX32 Case material: Stainless steel Glass material: Inorganic glass Accuracy: Average monthly difference ±20 seconds Water resistance: Reinforced water resistance for daily life (10 atm) Battery life: Approximately 3 years Weight: 87g Thickness: 8.3mm Case outer diameter: 34.0mm LumiBrite Screw back I'm including the description, though I'm not sure if it's the same item. Operation not confirmed. Please refrain from purchasing if you are concerned. No returns accepted.