CUCKOO CLOCK MECHANICAL 3D WOODEN PUZZLE3 AAA batteries required. WOOD CUCKOO CLOCK 3D PUZZLES WITH REAL FUNCTIONPress the stair button, watch as the charming cuckoo bird emerges on the hour (customizable timing), fluttering its wings and singing 3 tunes of "Cuckoo~" to bring joy to your home. Mechanical wall clock made of 435pcs, measures 13. 4" x 8. 3" x 6. 7" when finished, taking about 8 hours to build. Are you ready to complete this interactive 3D wooden puzzle clock? LIGHT UP FAIRY