Providence VITALIZER BF A buffer for bass. Brand: Providence Model Name: VITALIZER BF Type: Active Impedance Converter Condition: Good Input/Output Terminals: IN/OUT It was on my board until recently, but I'm selling it because I'm reconfiguring the board. This is a used item, so please purchase only if you understand this. Operation has been confirmed. Please refrain from purchasing if you are sensitive to used items. Velcro is attached to the back, so please be aware of this.