Main Features: – This piano is a small size one, and is portable and convenient to play by children students. – It can cover the needs of children and primary school,and it can be more suitable for the music performance and the music training. – Using the tone adjustment keys, 8 kinds of tones can be selected. – Two power modes, usb calbe or 4 AAA battery, economical and practical. – Inside speaker, support external power speaker and earphone, won’t disturb others while use earphone.