This is the second watch I have ordered and love it because it sets itself when daylight savings time occurs. Love that it announces the time and date if asked. The first model I ordered had to be exposed to bright light to recharge it, as it does not run on a battery.  This model has a battery, but can set itself if necessary if placed in a window to receive the Atomic Clock signals in the US. This model came with an extra battery when the time comes to change it, and you are provided with a video link on Youtube showing you how to wake the watch up and get it running, and how to set the time zone for your specific location in the world.