Your child hears a text from a CD
in the headphones (wandering from ear to ear). It silently reads the same text in its text book.
Then your child speaks the same text into the microphone. It now hears its own voice wandering from ear to ear. In the third step, your child hears the text from the CD
and speaks (reads) in parallel to the microphone. Your own voice and that of others are always heard in opposite directions; Both walk from ear to ear here too.
By hearing your own and someone elses voice as a role model, your child automatically learns to understand language better. Vocabulary, pronunciation and spelling are among the skills that lateral training specifically promotes.
The price is available on request from the manufacturer / distributor.