The most popular clip-on tuner by a long shot! Tracks fast; very accurate. Clip on tuner with switchable internal mic has a color changing, segmented (needle-like) display. Easy to use. Stay-Put clip, tap-tempo metronome, transpose feature, pitch calibration from 415hz to 466hz. High Sensitivity Vibration Sensor. Choose the sensor or switch to the internal mic. Features extended frequency range for all instruments. Display rotates 360 degrees -- works well for left-handers. Metallic Red color. Uses CR2032 battery. Excellent design, works well on all stringed instruments, even bass.