KORG CA-1 chromatic tuner with sound selection and calibration functions. Includes batteries, so you can use it right away. Easy to use and works well as a tuner. There is a bulge on the lid, so it's discounted. - Brand: KORG - Model: CA-1 - Type: Chromatic Tuner - Features: Sound selection, calibration function - Power: AAA batteries (2) As shown in the fourth photo, there is a gap in the case, but I have been using it as is. I will ship it with batteries, so you can use it immediately. Thank you for looking.