BOSS TU-2 Chromatic Tuner with bypass function, DC 9V power supply. It was used on a pedalboard and shows signs of use. Operation has been confirmed. I used DC power, but it worked fine with 9V. (Last photo) This is an older item, so please understand that it is non-refundable and non-returnable. Please feel free to message me if you have any questions. - Model: TU-2 - Type: Chromatic Tuner - Power: DC 9V - Max Current: 200mA - Output Terminals: OUTPUT - Input Terminals: INPUT - Bypass Function: BYPASS - Check Function: CHECK Thank you for looking.