Sound device for Children's electronic book

This sound device is installed into the Children's sound book. Can put the button inside in each page of the book. The children can press the buttons on each page to activate the sounds . The book is recommended for kids ages 18 months and older.

Duration time for sound: each button can put 3-30 seconds sound.

Batteries: 2PCS CR2032 Bbutton cell (replaceable battaries)

material for battery housing: ABS

Customized design are welcome