This is a tc electronic clip-on tuner. I purchased it used. The mechanical connection is not good (see photo 2). Also, there is some filling in with a marker on the inside (see photo 3). It can tune, but the condition is not good, so I'm selling it as junk. I will wrap it in bubble wrap and send it in an envelope. Please purchase only if you understand the above. To reiterate, this is a junk item.