1,Sound module used in children's books 2,the sound and the quantity of buttons can be designed 3,OEM 4,ABS material 1,Sound module can be used together with Children's Picture Books.2,Sounds including the animal series,traffic tool series ect.or customer sound.Sounds can be heard when pressing the relative relative.3,The qulitity of sounds can be designed by customer4,Fit for children to listen ...