I purchased this previously, but I haven't used it and have been storing it. Please refrain from price negotiations. [Product Description] The KORG GI-12 is a high-precision chromatic tuner for guitars and basses. - Brand: KORG - Model: GI-12 - Type: Chromatic tuner for guitar/bass - Features: Auto/Manual mode - Output: DC output - Power: AA batteries or AC adapter - Battery type: AA size Thank you for looking.