This is a Korg clip-on tuner I bought about 10 years ago. I couldn't find the model number (as it's not written on it), so I'm listing it in this condition. I bought a new battery to test its operation and confirmed it works. I will also include the new battery. Please only purchase if you are okay with the item as it is, as it has been stored personally. Addition: It seems the model number is AW1, but as I don't have the box or manual, I'll lower the price.