Operation confirmed. Batteries are not included. They are sold at 100-yen shops (CR2032). - A chromatic tuner compatible with a wide range of instruments such as guitars, basses, violins, and ukuleles. - Piezo type that detects the vibration of sound. - Clip-on type for easy attachment and detachment. - LCD screen with excellent visibility, changing from red to green. - The display orientation can be changed to an easy-to-see position.