A great show with a great look! Solar and radio-controlled, the perfect couple! no need to change battery, simply leave the watch in a lighted room (day) on days when you do not wear it. Once the watch set to the correct time zone (very easy with the French manual comes with). She made her updates every night, and always at the exact time to the second! simply leave it near a window at night. Ultra resistant to shocks, with sporty look / aviator, it rocks! A technological marvel, congratulations casio! Waterproof to 200m and more, no worries to go swimming and snorkeling.