Trondheim Audio Devices SkarBassOne Bass Preamp; Effects Pedal for Electric Bass; complete analog Effect Pedal for Bass Guitar; can be connected directly to an Amplifier, Interface or DI box; fast FET Compressor, precise Midrange Filter and Multiband Drive that ranges from light Overdrive to heavy Distortion without compromising the low fundamental frequencies; Controls: Mid, Drive, Tone, Compression, Mix; LED: Status (Red: Drive & Tone On, Blue: Drive & Tone Off, Aus: Effect Bypass); Compression Amount; Footswitches: Effect/Drive & Tone Bypass; Connections: Input (1/4" Jack), Output (1/4" Jack); Power Supply connector: Barrel Connector 5.5 x 2.1 mm, center negative; Current Draw: 5,5 mA (9V) mA; powered by a 9 V DC Power Supply (not included); True Bypass; Dimensions (W x D x H): 112 x 80 x 48 mm (4,41" x 3,15" x 1,89"); Weight: 280 g (0,62 lbs); Note: Battery operation is not supported