Have this alarm for several years. Absolute accuracy. This alarm clock has never readjusted after commissioning. No noise through the passing second-hand. The battery had to be changed after about 2 years for the first time. Can be super easy to operate and also great to read in the dark. The sound makes for Aufstehn ;-) So shall it be Have now a second identical clock in our household in use. The two run in perfect synchronization. Atom Inside? ;-) Nee Nee was just a joke. But are close to the atomic clock ... :-)