This harmonica is a diatonic and a chromatic all in one! It's an instrument that has the same note layout as a regular 10 hole diatonic harmonica, but it offers a push button slide assembly for raising the notes a half step like a chromatic. If you're a diatonic player tired of not being able to bend all of the notes you need for blues and jazz improvisations, then this instrument is for you. This combination offers the creative player new possibilities in sound and tonal colors.