It comes ready to use and you can immediately enjoy the many features of this toy (the original batteries with a very limited autonomy, it will still change quickly).
Both entertaining and educational, this mischievous baby learning to count emits funny sounds, recite nursery rhymes or can trigger or nice melodies as you press. Finally, cuckoo function / hidden is not the one with the most success. Note that it is possible to adjust the volume, significant function.
Very good quality / price ratio for a toy like this.