This clever wall clock measures 11" in diameter. It has a quartz movement with a chromatic scale dial. The chromatic scale is a musical scale with twelve pitches, each a semitone or half step apart. "A chromatic scale is a non-diatonic scale consisting entirely of half-step intervals," having, "no tonic," due to the symmetry or equal spacing of its tones. This will make a great gift for your music instructor's studio, or simply for the musician in your life!