Chemnitzer concertina

A Chemnitzer concertina is a musical instrument of the hand-held bellows-driven free-reed category, sometimes called squeezeboxes. The Chemnitzer concertina is most closely related to the bandoneón (German spelling: Bandonion), and more distantly, to the other types of concertinas and accordions. It's essentially a bigger version of the Anglo Concertina that sounds more akin to an accordion due to having multiple ranks of reeds.