This is an electronic wind instrument. It produces sound simply by blowing into it, like a recorder. The keys are based on the saxophone (sax) key layout, and you can choose between sax or recorder fingering. It charges via USB and can be played for 4 hours on a single charge. It has a built-in sound source and a relatively large speaker. When the volume is at its maximum, the sound is louder and clearer than when playing a recorder or ocarina in a room, and it resonates throughout the room. The sound colors can be selected from 10 options: alto saxophone, soprano saxophone, clarinet, panpipes, trumpet, violin, harmonica, flute, bamboo flute, and recorder. The buttons on the instrument allow you to adjust the sound color, volume, fingering type (sax or recorder), breath sensitivity, and reverb (echo). So, you can enjoy various sounds with just this one instrument, but what does the product name "midi EWI" mean? Why is it named this way? I (the seller) believe that the feature and appeal of this instrument is that, depending on how you use it, you can transform it into a higher-end model worth tens of thousands of yen for free. I (the seller) have previously used the AKAI EWI USB (currently discontinued). This is a "wind USB controller" that does not have a built-in sound source. When using this, you install sound source software on your computer. The sound source software "ARIA" installed at this time is equipped with 82 high-quality sounds optimized for the EWI USB. You can enjoy playing the EWI USB in any style or genre, including general woodwind and brass instruments, as well as string instruments, percussion instruments, and synth sounds. And this software can be downloaded for free from the AKAI EWI USB product homepage. You can get the sound of a higher-end model worth tens of thousands of yen with this instrument, which costs less than 10,000 yen even when new. I (the seller) have proven that ARIA can be used with this instrument. Of course, it's an instrument that you can enjoy even without doing such slightly complicated things. Once you get used to it, you might want to move on to using the midi functions.