The Chromatic Harmonica - The Musical Harmonica.
The chromatic is mostly used for jazz, classical, and pop music- The chromatic harmonica is typically used in jazz, classical, pop, and music where the melodies require more than a 7-note scale (like the one on a standard diatonic). A classic example of where a chromatic would be required is the theme song to "Midnight Cowboy". The original theme to "Sesame Street" was also played on a chromatic.
With a Chromatic Harmonica, all accidental notes (sharps and flats) are immediately available by pushing in the slide button. Each single hole contains four reeds; two natural tones and two chromatic tones are enabled by pushing in the slide button on the side of the harp. Most chromatics are solo tuned, meaning each group of 4 holes completes one octave (inhale for one note, exhale for another). The slide button adds the "black keys" of the piano, by changing the full tones to half steps.
Hohner Super Chromonica 270 Chromatic Harmonica
Hohner Chrometta 8 Chromatic Harmonica - Key of C
Hohner Educator 10 Chromatic Harmonica - Key of C with pouch
Hohner Super 64 Chromonica #7585 Chromatic Harmonica