Chromatic Tuner fit for Guitar/Bass/Violin/Ukulele/some of wind instrument Tuning mode: Auto Items of tuning: Chromatic A4 frequency: 440Hz Size: 60 x 30 x 45 (mm) Battery: CR2032 (1pcs,extra 1pcs) The tuner is great for beginners and professionals. It is fast, accurate, automatic and easy to operate. One button controls everything. Clipped it on, pressed the button and you will had your guitar or other instruments tuned soon Tuning mode: Auto Items of tuning: Chromatic A4 frequency: 440Hz Size: 60 x 30 x 45 (mm)