Tenor melodicas are the most common type of melodica. The left hand holds a handle on the bottom, and the right hand plays the keyboard. Tenor melodicas can be played with two hands by inserting a tube into the mouthpiece hole and placing the melodica on a flat surface.
Soprano melodicas are thinner than tenors and are designed to be played with both hands at once; the left hand plays the black keys, and the right hand plays the white keys.
Popular melodica manufacturers include Hohner, Samick, and Bestler.