A delightful twist on the traditional cuckoo clock. On the hour out pops Hannah Holstein with her suitably bovine greeting. " Moooo". Those who would like an encore can push a button on the side of the clock. A light sensor automatically turns off the cow character when the room becomes dark. Coo Clocks also include a swinging flower shaped pendulum. For operation, please be sure to get 3 "D" size & 1 "AA" size battery.