Here is a Japan made Boss AD-8 acoustic guitar processor pedal with it's power adapter in excellent condition.

Sweetwater Sound says features include:

• Floor-based acoustic guitar processor featuring COSM Acoustic Guitar Modeling technology
• Turns ordinary piezo-equipped acoustic guitars into 6 of the world's finest acoustics
• Body and String Enhance controls simulate warm, miked acoustic sounds
• High-quality reverb tailored for acoustic guitar, 4-band EQ, and Anti-feedback
• Onboard chromatic tuner with Mute function and quick pedal-based operation
• 4 preset memory locations for switching acoustic sounds instantly
• Balanced XLR outputs allow direct connection to PA systems
• Runs on 6 x AA batteries or optional power supply (not included)