Cecilio CT-15D Mini Clip-On Tuner Clip on and turns 360 degrees for easy viewing, Mode: Guitar, Bass, Violin, Cello Tuner Pitch Shift: 435 Hz to 445 Hz LCD Screen: 1.2" x 0.8" and LCD Display: Blue backlight Battery powered (CR2032 3V Battery Included) Dimension: 2.3" x 1.2" x 0.5"