I like Poljot, but I went to an actual Poljot store and tried a few of their models and found many of them were quite poorly made. Hopefully, this Alarm Traveller is considerably better. This has a mechanical alarm. The extra crowns are for setting the time and winding the internal alarm. Much like a Seiko Bellmatic, the alarm sounds like a teeny-tiny clockwork alarm clock as hammers pound on the sides of the case. Cute.