Sabine FBX 1020 PLUS, Mono Feedback ExterminatorCondition:* Used, Removed From Service In Working Condition.* Tested Fine For Basic Operation. As Pictured.Additional Notes:* 20-bit Digital Resolution* 12 FBX Filters* ClipGuard Adaptive Clip Level Control maintains optimum clip level, increases dynamic range to 105 dB, and prevents digital clipping* Turbo Setup Mode- grabs feedback faster and at lower volume during setup* More gain before feedback (6 dB to 9 dB typical)Sabine FBX 1020 PLUS