Quartz Cuckoo Clocks are full sized Cuckoo Clocks that run on three C batteries. You do not need to wind them. The chains and weights are just for show. Each clock has a bird that comes out at the top of each hour. It will "cuckoo" the number of the hour and then play a song. Each clock has twelve songs, one for each hour. They also have a light sensor that automatically shuts the sound off when it is completely dark. There is a manual switch on the side that you can turn just the music or all of the sound off as well. Some of the models even have a volume control.