This is the second time that I have purchased this watch. The first one still works fine after 4 years. I have a very expansive watch that I never wear because it does not perform like the Casio. The G-Shock Atomic/Solar is without the best watch that I have ever worn. I am 63 and I will never wear a different watch than this. Aside from the fact that it is fashionable, it is dependable because it never needs a battery, never needs to be calibrated to the correct time because as the title denotes it is atomic and solar. Without a doubt, the best watch ever...........................