fictitious piano keyboard / projector

When you gathering with friends,teaching children piano or fiverting yourself,you want to play piano for entertainment but find there's no piano to play, will you feel limited? As to this, we design one projector combing with mobile which can project fictitious piano keyboard on table.Linking with APP mobile piano,the interface routinization of piano can project a piano image through the code--enjoy the amusement of music without space limit.