EWI?4000s is the instrument used in the Oriental Electric Flute series

There is also an EWI?USB in the picture

4000S requires four batteries. The working weight is 1.2KG, which is very heavy...

EWI is the abbreviation of Electric Wind Instrument

This type of instrument is commonly known as electronic flute and electric horn, and is also known as electronic flute in Japan. called electric flute