Boss AD-8 Acoustic Guitar Processor in full working order. A highly regarded acoustic preamp and modelling pedal designed to enhance the sound of piezo-equipped acoustic guitars, making them sound more natural and microphone-like. Ideal for live performance, recording, or direct connection to a PA system. Features: COSM Acoustic Guitar Modelling Acoustic body and string enhancement Built-in reverb 4-band EQ Auto Anti-Feedback function Built-in chromatic tuner with mute 4 user memory presets Balanced XLR outputs and ¼" outputs Can be powered by 6 x AA batteries or a Boss PSA 9V power supply (not included)