Features:  Foldable Piano: The 61-key rollable keys are international standard keys, which is small and can be hand carried, It can also be rolled up for easy storage in your hand bag or carrying case.    Multifunctional Electronic Piano: With 5 diatonic scales, bringing international standard sound. 100 Tone Functions, 128 Rhythm Options, 30 Demo Songs, 92 Notes. Built-in 40 demo songs for learning and enjoying classic songs.    Built-in Rechargeable Lithium Battery: The piano uses 4* 1.5V batteries which can last for up to12-15 hours of playing time. It can be connected with earphones and external speakers with MIDI interface. You can  plug the piano into a proper electrical outlet with an adaptor.    Specifications: Key:61;  Tone:128;  Rhythm:128;  Demonstration Songs:30;  Rated Voltage:DC6V(Battery AA1.54pcs);  Output:500MW;  Mainbody:9.6*22.8*3.3cm;  Keyboard:88*17.4*0.5cm;  Power Supply:4 AA batteries;  Power:DC 6V adapter;  Control Box Size:9.6*22.8*3.3 cm;  Keyboard Size:88 *17.4 *0.5cm;  Item Weight:830g;  Package Size:28.1*9.8*8.8cm;    Packing List: 1 * Piano;  1 * USB Cable;  1 * Users Manual