Correctly place the animal puzzle piece in the eight-piece wooden peg puzzle and the sound of the animal is heard in its own voice! The Melissa & Doug Farm Animals Sound Puzzle not only features the sound of the animals but also includes full-color, matching pictures under each piece to help develop matching and listening skills in 2-4 year-olds. The multi-sensory puzzle has light-activated sensors. For best results, expose the sensor by removing a piece in a brightly lit room, then make the sound play by replacing that piece in the board. The required AAA batteries are not included.