This is a wonderfully accurate time piece that will never need a battery.  It charges quickly in both natural and artificial light and will stay charged for up to six months in total darkness.  It is easy to set.  All you do is select a city from your time zone and the watch sets itself via radio control.  I am still getting to know this watch and its features.  My only complaint is that some of the display numbers are a little small for a middle aged guy, so I have to squint at times.