This is a BOSS TU-12 tuner. Battery and adapter operation confirmed. All buttons work. Input and output confirmed. It's in good condition for its age, but the case on the outside is separating from the main body where it fastens. You don't see many of these analog needle-type tuners these days, so grab it while you can. No claims, no returns. Feel free to negotiate the price. I will wrap it in bubble wrap and ship it in a dedicated box.