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.Keyboard: 49 keysTone: 8Power: 4 AAA battery, support external power resource DC 5VDemonstration songs: 6 demo songsVolume: Knob volume control in clockwisePower-saving Mode: Smart sleep after 3 minutes with no playProduct Weight : 565 G / 19.93 OuncesProduct Dimensions (L*W*H) : 800*125*9 MM / 31.50*4.92*0.35 InchesPackage Weight : 740 G / 26.10 OuncesPackage Dimensions (L*W*H) : 150*88*22 MM / 5.91*3.46*0.87 InchesPackage Include:1x Roll Up Piano1x USB Cable1x Instructions