Hola! AT-101 Chromatic Clip-on Tuner for Guitar, Bass, Violin and Ukulele - Easy Tune 2 Color Screen Light Hola! AT-101 Clip-on tuner has high sensitivity vibration sensor and 5 tuning modes: Guitar, Bass, Ukulele, Violin and Chromatic. Display rotates 360 degrees for easy viewing. Good visibility at day or night. Screen turns green when in tune. Clear instructions included. One button operation. Battery Included. Hola! Music guarantees quality and affordability. Hola! - Say Hello to Music!