Shirley Branch of Musical Sneakers has an apparatus designed for preschooler that is installed in the tongue of the sneaker. It has an on/off button & speaker, when button is pressed Children's Ed./Classical Musical Music plays. Intended for 3-8 years, but device can be put in any size sneaker. Cost to manufacture apparatus: $25.00, and retail price is: $350.00. Those who purchase are family member & friends who have a passion for music and believe a child should be taught early.