Operation confirmed. Batteries are not included. They are sold at 100-yen shops (CR2032). - Clip-on auto-tuning meter for easy operation. - By attaching it to the headstock of a guitar, it detects the instrument's vibrations and accurately measures the pitch with ease. - In addition to the chromatic mode, which is compatible with many instruments regardless of stringed or wind instruments, you can switch to dedicated measurement modes for guitar, bass, ukulele, and violin. - The bright and large display is ideal for tuning in dark places.