An atomic digital LED clock displays the time very accurately. Some atomic clocks can show the time down to the 100,000th of the second. Details like the day, date, week, month, year, and even the temperature in your home can be displayed on an atomic clock as well.
If you like simplicity, then going atomic can be a bit overwhelming. For people who enjoy the details, then one of these clocks can be a very useful, functional, decorative piece for the home.