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, it can also switch to dedicated measurement modes for guitar, bass, ukulele, and violin. - The bright and large display is also ideal for tuning in dark places.