This roll-up piano is equipped with a numeric keyboard for 128 tones and 128 rhythms listed in the manual. You can quickly switch to the tone or rhythm you want instead of tap several times. Compared with other common products on the market, our product is more light - only 2.76 pounds. The piano built-in 20 demos, the working time could be last for 12-13 hours. The roller piano can be played on any plane you want, such as a table, floor, and bay window. You don't even have to open it completely to play. The piano can be rolled up to a small size into a small bag for you to store or carry out. Long battery life and loud loudspeakers can prevent you from being bothered by wires which is suitable for a family party, classmate party, birthday party. Just play it to increase the happy atmosphere.