The ways to set the location of the battery compartment as it needs to be removable to allow the re-insertion of new batteries.

A verification sound module is produced to make sure the sound buttons are positioned correctly, with no interference, before we go into production.

Each sound element is positioned in a different location on the sound membrane so when one button is pressed, no other sound is played.

Individual Sound modules with buttons or Buttons inserted inside the book, connected by electric wire. Control by the microchip. Two main ways of Sound Audio book finialized.