The Phantom Block runs on 48V phantom power via the XLR output, external 9V pedal power, or you can install a 9V battery than will run about 100 hours. The high impedance input gets optimum tone from standard passive pickups, and the gain control goes from clean to overdrive. The Phantom Block will produce a wide range of tones covering the most popular sounds, and the master knob adjusts overall output level. Switchable Cab Sim warms up the sound of the electric guitar, while FR suits other devices such as acoustic guitar, keyboards and modeling outputs.