Clip universal digital tuner for chromatic, guitar, bass, and violin Mini shape, easy to takeDifferent background light to show different tuning statusRed and green background light to used for Frequency for A tone: 430Hz 450 HzPick up: "MIC"and "CLIP"Tuning mode: Chromatic, guitar, bass and violinSize: 53 x 80 x 43mmPower: button battery (Cr2032)