This cuckoo clock has an exclusive life-like wooden handpainted cuckoo. With certificate of authenticity from the Black Forest Clock Association (VdS). It has a mechanical extreme long-life rack strike movement. It allows turning the hands left and right without endangering the mechanics of the movement. The 8 day running time movement need to be wind up once a week, that means you pull on the chains until the weights are up. The size refers only to the clock, without pendulum and weights.