Thank you! This is a convenient clip-on tuner. The KORG AW-2 is a surprisingly useful clip-on tuner that can switch between MIC/PIEZO. - Brand: KORG - Model: AW-2 - Function: MIC/PIEZO switchable - Tuning Function: Calibration function - Clip Type: Clip-on, easy to attach I was using it until recently, so there are no particular problems with normal operation. I will not include batteries when shipping, so please prepare a CR2032 battery yourself when purchasing! Since this is a used item, please refrain from purchasing if you are concerned. I do not reserve items as per Mercari rules. To prevent swapping, no claims and no returns, please. The person who presses the purchase button will be given priority in any case. Please be aware that I am not selling on any platform other than Mercari. I hope it reaches someone who needs it! Thank you for viewing.