Cecilio TN-7 Mini Clip-On Tuner with Clip/Mic Switch Clip on and turns 360 degrees for easy viewing, Mode: Guitar, Bass, Violin, Cello Tuner with Mic/Clip-On Switch Pitch Shift: 435 Hz to 445 Hz LCD Screen: 1.5" x 1.0" and LCD Display: Blue backlight Battery powered (CR2032 3V Battery Included) Dimension: 2.3" x 1.25" x 0.5"