behringer FBQ1000 There are no noticeable scratches or stains. Operation has been confirmed. Accessories include only the power cable. Thank you. High-performance 2-channel feedback destroyer and parametric EQ Automatically detects and suppresses feedback frequencies from 24 frequencies FBQ filters with extremely narrow Q width provide effective feedback suppression while maintaining sound quality High performance of the feedback destroyer can be obtained with the default settings without difficult settings Auto mode constantly monitors the mix and automatically sets the filters