BOSS CS-3 Compression Sustainer. Made in Taiwan. I used this pedal until about 12 years ago. After I quit my band, I stored it in my home effects pedal case. I haven't checked for any sound quality changes. I have only confirmed that it powers on. It's difficult to see the check light when connected in a bright place. I confirmed that it lights up when it's dark. Please check the photos. The exterior has noticeable scratches and dirt. I haven't tested it with a guitar, and there's a possibility of malfunctions, so I'm selling it as junk. Please understand this before purchasing. There is no outer box or instruction manual. I will wrap the unit in bubble wrap and pack it in a cardboard box for shipping. The black stand underneath is not for sale. Please read my profile as well. Thank you.