It almost certainly uses one of the modern switched-mode power supplies which would probably work fine on anything from about 90 to 250 volts.
It's sloppy work in my opinion when the labels and manuals don't agree, not to mention confusing to people, but the reason is almost certainly to do with the nominal supply voltages which are/have been used in various parts of the world.
My guess would be that the manufacturer had different people writing the English and Spanish parts of the manual and rather than working to the one specification they "adapted" it slightly to suit what they thought was the intended market. 220V has been the declared voltage in many Spanish-speaking countries for years, while 240V is more traditionally associated with the U.K., Australia, etc.
The specified supply voltages are only nominal values anyway; the precise voltage will vary up and down during the day depending upon electrical demand in the area.
In a nutshell, you should be fine.