Operation confirmed. It is in good condition with no noticeable scratches or stains. Batteries are not included. They are sold at 100-yen shops (CR2032) Tuning modes include guitar, bass, violin, ukulele, and chromatic, allowing tuning for each instrument. In addition to the modes for each instrument, the chromatic mode can be used to tune any instrument that can be attached with a clip. 【Easy one-button operation】 1. Press and hold the power button to turn the power on or off. 2. When the power is on, briefly press the power button to cycle through the modes: chromatic → guitar → bass → violin → ukulele. 3. When you play your instrument, the pitch will be displayed on the screen, and the meter will move. The pitch indicator will be in the center when in tune. 4. The power will automatically turn off if no operation is performed for 5 minutes.