First of all, they are in no way tied to the atomic bomb.
The only reason to call them atomic is because they are in sync with the main atomic clock in Boulder, Colorado, and use the resonance of atoms to maintain an accurate time.
The main advantage of an atom is that it provides incredibly accurate time. They are very small and easy to work with. Most come with a charged battery so you don’t have to worry about going out in the event of a power outage.
You never have to set the time! The atomic travel alarm clocks do that for you. However, you need to set the alarm. This is because atomic clocks work more like radios than clocks. You tune in to the giant atomic clock in Boulder, Colorado. They really use the resonance of atoms to tell time, rather than small gears and levers.
Some atoms resonate so predictably that you can literally set your watch to them. This is why these non-radioactive atoms are used in nuclear trip alarm clocks. One of the common atoms is cesium-133, which is always in resonance at 9,132,631,770 cycles per second. This means you get a very accurate travel alarm clock.
The main disadvantage is that nuclear travel alarm clocks run on batteries. Although we have batteries today that are very long-lasting, they don’t last forever.
Another disadvantage of these watches is that they cost more than other types. Sure, they look cool, but do you really need them in the age of cell phones with internet access and super duper watches? Still, some people prefer to use travel clocks instead of a phone or alarm clock because the buttons are larger.