Thank you for viewing. Please note that we do not negotiate prices. Although it is a beautiful item, it is a used item, so please refrain from purchasing if you are concerned. No returns or refunds, please. This is a Radial StageBug SB-4 Direct Box. It is an active direct box that supports 48V phantom power, and is ideal for piezo inputs. - Model Name: StageBug SB-4 - Type: Active Direct Box - Power: 48V Phantom Power - Features: Supports Piezo Input - Accessories: Warranty - Output Terminals: OUTPUT - Input Terminals: INPUT - Other Terminals: AUX This unit is an active DI box that is ideal for acoustic instruments such as violins, mandolins, cellos, and upright basses that use piezo pickups. It smoothly outputs ultra-high impedance signals from piezo pickups. It provides a warm tone and removes unwanted noise components and peak components often found in piezo pickups. With this unit, a preamp is not needed between the pickup and the PA. Just plug it in and play. ● Connecting a tuner or guitar amp This unit has an AUX terminal for connecting a tuner. You can connect not only a tuner but also a guitar amp to this terminal. You can monitor the sound from the amp on stage while simultaneously sending a signal to the PA. ● Using a high-pass filter This unit has a high-pass (＝low-cut) filter. This removes low-frequency noise, resulting in a cleaner and clearer sound. ● Inverting the phase The PHASE switch is used when you want to reduce feedback on stage. ● Using with a classical guitar Connecting a piezo PU directly provides the best sound. A preamp is not required. The low-pass filter removes unpleasant resonance. Because it is a balanced signal, noise will not be introduced even when using long cables, and the natural sound is maintained.