The first thing you’ll note is the full screen feature does not work. That being said you can either have a few clocks too small to really get detail where they are or you can zoom the clock so large it fills the tiny little screen. For my money you are much better off getting a free world clock or purchasing one with some ratings. I assure you will want a refund after purchasing this app. Good luck. I am curious if this review will be suppressed so more apps can be sold to unsuspecting victims.