Ok, so this isn't exactly audio gear, unless you're into listening to synthesized single tones...
I'm selling a black Seiko auto tuner (the kind that you use for tuning instruments), and has a VU meter, as well as triangular "flat" and "sharp" LEDs, to show how far off you are from the correct pitch, as well as rectangular LEDs that show you which note of the scale (C#, for example) you are playing, and round LED's display which octave the note is in. The auto-tuner has a range of 7 octaves.
It also has a tone generator that can play any pitch within 5 octaves. You can calibrate it to tune from A438 to A445.
It has a built in speaker and microphone, but has input and output 1/4 inch jacks, so you can hook it up to an external mic or speakers, although I've never tried this feature myself. It accepts either a 9V battery or a wallwart, which I will include.
It is in near-mint condition, because I rarely used it after my parents bought it for me a few years ago. It functions perfectly and has only very faint scratch marks on the glossy black portion on the front resulting from careful use.