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About the solution
As part of his therapy, the child needed to use Big Mac Buttons, which consist of large buttons that record and play back certain words or phrases. The individual just has to push the button with a pre-recorded saying like: "Help me". However, these are very expensive.
The father's desire of expanding his child's button vocabulary triggered the adaptation of the button into a multi-word recorder by using inexpensive materials, having a production cost of about $8 for each button
Adapted from: http://www.instructables.com/id/My-E-Mac-Button/
This solution shall not include mention to the use of drugs, chemicals or biologicals (including food); invasive devices; offensive, commercial or inherently dangerous content. This solution was not medically validated. Proceed with caution! If you have any doubts, please consult with a health professional.