This Beringer Feedback Destroyer Pro 1100P is a 19" rack mountable feedback DSP / processor with XLR and TRS balanced connectors. Useful for small analog mixing setups or garage band use. Comes complete with original box and the best part is this unit has integrated power supply (no wall wart required). This unit operates by applying narrow band EQ at the resonant frequencies at the start of feedback. The best part of this unit is that it has an integrated power supply (no wall wart).