This is a classic bass preamp from BOSS. It produces a thick, powerful sound without thinning out the tone. It also has a line out, making it a very practical bass effects unit. The mirror finish gives it a high-quality feel, and it looks great when integrated into a pedalboard. Use this when you want to create a really cool sound! I bought it new and used it on my pedalboard, but I'm selling it because I haven't been using it much lately. This is a used item, so there are signs of use, scratches, and paint chipping, but it works perfectly fine. I've attached professional-grade Velcro to the back, so it will be securely fixed to your pedalboard and provide stable use. I was using it on my board until recently, so I've confirmed that it works. There is no crackling in the knobs, and the jacks are in good working order. Original box, warranty card, and instruction manual included. Price is negotiable. Quoted from Soundhouse below: ■ Bass Effects Unit ■ Bass Driver ■ Nominal Input Level: -20dBu ■ Input Impedance: 1MΩ ■ Nominal Output Level: OUTPUT jack: -20dBu, LINE OUT jack: -20dBu ■ Output Impedance: OUTPUT jack: 1kΩ, LINE OUT jack: 600Ω ■ Recommended Load Impedance: OUTPUT jack: 10kΩ or greater, LINE OUT jack: 600Ω or greater ■ Controls: Pedal switch, LEVEL knob, BLEND knob, LOW knob, HIGH knob, DRIVE knob ■ Indicator: CHECK indicator (also serves as a battery check) ■ Connectors: INPUT jack, OUTPUT jack, LINE OUT jack (TRS standard type), AC adapter jack (DC9V) ■ Power: Alkaline battery (9V type) or manganese battery (9V type), AC adapter (sold separately) ■ Current Draw: 54mA ■ Battery Life (varies depending on usage): Alkaline battery: Approximately 6 hours ■ Accessories: Warranty card, instruction manual, leaflets (Safety Precautions, Usage Precautions, Service Contact), Alkaline battery (9V type); connected to the main unit ■ Optional: AC adapter (PSA-100) ■ Dimensions, Weight: 73W x 59H x 129Dmm, 450g