About product : This fun tool helps transition oral airflow into easy onset vocalizations for clients with velo-pharyngeal insufficiency, voice disorders, and fluency disorders. Color will vary. Many therapist ask me how to teach a child to produce the /s/ vs the /z/. The easiest way is to teach voice on using a kazoo and voice off with bubbles! Also, for many of my kids, they voice when blowing. Using a kazoo gives them a fun way to teach voice on and then horns voice off. Kazoos and horns are a great way to teach volitional voice on and voice off!