Largo Perpetual Calendar - The Eco-Drive Perpetual Calendar taken to new heights of style . . . . 270-Day Power Reserve and no batteries to change - ever! . . Perpetual Calendar Automatically Adjusts for Oddand Even Months and Leap Years through 2100 . . 1/20 Second Chronograph Measures up to 60 Minutes . . 12/24 Hour Time . . Dual Time . . Alarm . . Charges in Sunlight or Indoors . . Solid Titanium Steel Case & Bracelet . . Power Saver Function . . Low Charge Indicator . . Push-Button Deployment Buckle . . Time Reset Advisory . . 100 Meter Water-Resistant . .