EDEN Bass Preamp WTDL Missing original power adapter. Operation confirmed with a 18V power supply (user-supplied). Bass knob is aftermarket. 【High-Quality Sound】 EDEN effects pedals deliver professional-grade sound quality. In particular, the compressor function adjusts the dynamics of the sound, making your performance richer. 【Multi-Functional Controls】 Gain, Enhance, Compressor, Treble, Mid, Bass, and Master knobs allow for fine-tuning of the tone. It supports a variety of musical styles. 【Durable Design】 The metal body is highly durable and ideal for live performances. It also features a bypass switch, allowing you to easily turn it off when not in use. - Brand: EDEN - Model: Effects Pedal - Control Knobs: Gain, Enhance, Compressor, Treble, Mid, Bass, Master - Switch: Bypass Switch - Material: Metal