Cherub ST710 Suction cup chromatic Guitar Bass Ukulele Violin tuner(Black) This is a special original Suction Cup tuner! The super strong suction cup replaces the old clip to make it portable, fashionable and simple without affecting the beautiful headstock. The innovative zero-button design.Rotate the tuner 90 degrees to turn on/off. chromatic tuning mode and high brightness color LCD make the tuning become easier and more convenient. Tuning rangeA0(27.5Hz)~C8(4186Hz) .A4 range440Hz