A:AnswerA MIDI interface is a technical standard that describes a protocol, digital interface and connectors and allows a wide variety of electronic musical instruments, computers and other related devices to connect and communicate with one another.
A:AnswerYes, it closes with little to no problem. It does not have protruding handles/ knobs like on a standard piano, but it can be grasped and closed easily.
A:AnswerIt does not come with headphones, but it does have two headphone jacks for the larger 1/4" (quarter inch) headphone connector. If you're using headphones with the 3.5mm connector common to casual listening headphones or earphones, you'd need an adapter.