Good multifunction watch for who likes to have different time zones, calculator, calendar, multiple alarms and all in a waterproof case. You have to see if the battery will keep the time announced that is up to 10 years. The problem is when the battery fails, all data is lost. Casio should have remedied this problem with a chip from the number of years that the manufacturer offers this kind of watches ... A gap then. It takes a relatively large because the wrist watch is quite impressive because of the calculator's keys; So, ladies, this watch will not be very flattering to your wrist. As many know. When the watch is in black or colored resin, the strap is rubber. It is therefore more fragile when the watch is color aluminum housing as well as in the latter case is anyway resin for reasons of weight, the bracelet, he, however is steel. It lasts longer. The watch, in this case, is slightly more expensive (about 10 to 20 euros depending on the market).