The Clap Book is made to open and to close.
Because every time you open and you close it, there is something inside that moves and makes a noise:

Flap, flap… a butterfly flaps its wings.
Fomfim… an accordion stretches and shrinks.
Bong, bong… a boy plays a drum with all his energy.

The Clap Book does not need batteries or battery, just your hands, one on each side.

Clap, clap, clapping for readers!