These unique puzzles are great fun, even for very young kids that can't do simple peg puzzles all on their own yet. When the wooden, pegged piece is lifted from its space, the sound of the object, music note, or name of the letter or number removed is emitted from a small speaker within the puzzle. The Emergency Vehicles Puzzle contains even more bells and whistles, with sounds and flashing lights. As soon as young children pick up on this, I suspect they will soon identify "favorite" pieces! Puzzles are handcrafted and are of wood construction with beautifully painted images. The sound box runs on 2 AA batteries (not included). So, if it gets to be too much, just remove the batteries, and the youngsters will have to play with it just like any other "normal" peg puzzle.