Casio makes the best digital watches in the world. This latest Pro-Tech PRW 2500-1 is thus far one of the best Casio's I have owned. I have two other ones with similar features as this one, and the calendar is good to go up until the year 2099. This watch will outlive me by 35 years if I live to be 100! (will have had it for over 51 years). I have one of Casio's first battery rechargeable watches... had it for about 20 years or so and it still works perfectly. By far, Casio makes great watches that are durable, has the most important features I look for in a digital watch (atomic timekeeping, solar rechargeable, moon data, weather data, compass, etc.), and got it at a great deal at Sears.