A Keyboard Built with Your Child in Mind The Yamaha PSS-E30 packs tons of features and unique sounds into a compact and accessible package. Specifically designed for children, this keyboard features 37 mini keys designed to be easy for any child to use. To really stimulate your child's brain, this keyboard uses a function called Quiz Mode to help associate the sound of each key with a different note. 47 different voices, 74 onboard sound effects, and a plethora of songs round out the PSS-E30's sonic features. This keyboard can run on battery or USB bus power — and its compact size and built-in speaker make it ideal for practicing on-the-go! Sweetwater believes that every person should have an opportunity to embark on their own musical journey, and the Yamaha PSS-E30 provides that opportunity by helping your child cultivate a lifelong relationship with music.