AD_10 Acoustic Preamp BOSS Multi-functional acoustic preamp with feedback prevention. - Model Name: AD-10 - Function: Acoustic Preamp - Controls: Boost, Delay, Tone Adjustment, Loop Function - Connectors: Input, Output, Tuner, Mute - Features: Anti-Feedback Function, Compressor, Echo/Chorus Adjustment - Bottom: Anti-slip pads - Design: Compact and lightweight body ● Thank you for viewing. Purchased new a few years ago. Used a few times indoors. In clean condition with no noticeable scratches or stains. Please check the photos. ● Comes with box, instruction manual, and adapter. ● Packing material included. Thank you for your understanding regarding used items.