High-quality preamp for acoustic instruments, with TRS balanced output. - Model Name: AD-2 - Type: Acoustic Preamp - Output Terminals: TRS Balanced Output - Controls: Ambience, Acoustic Resonance - Input Terminals: Input terminals available Thank you for viewing. I purchased this used and only used it a few times indoors, but I am selling it due to various circumstances. Although it is used, there are no noticeable scratches, and I think it is in very good condition. Operation has been confirmed with batteries and an AC adapter. Line out has not been confirmed (as I do not have a TRS cable). In addition to the main unit, I will include the original box, all documents, and batteries for operation confirmation. Thank you very much.