At present, the biggest hand-cranked piano I know is the 6 1 key. I bought one before, and I feel bad. There is no piano feeling at all, especially the keyboard doesn't feel as good as the electronic piano (just like playing on wood). The sound quality and timbre are not satisfactory. Even if it's only used for practice, I don't think it's appropriate, and it's not good for cultivating piano practitioners (especially children) to feel and feel good. I don't advise you to buy it. If possible, practice directly on the piano. Of course, it's convenient to carry and good for entertainment.

The prices of hand-cranked pianos on the market vary from six or seven hundred yuan to two or three hundred yuan.

I may throw cold water on you, please forgive my frankness.