ENO ET-33 Chromatic Tuner Mini Auto Clip Chromatic Tuner Clip for Guitar Bass Violin Ukulele 360 degree Turning Turning 360 degree freely. Adjustable view angle. Super anti-interference. Sensitive and stable. Handy compact digital clip-on style. Tuner picks up the sound by vibration. Easy to clip onto any stringed instrument. Tuning Pitch Indicator Light:Low: Indicator to the left and LCD screen turns white; Hight: Indicator to the right and LCD screen turns white; In tune: Indicator to the middle and LCD screen turns green.