Diezel VH4-2 Pedal, Effects Pedal, Overdrive / Preamp, Based on channels 3 & 4 of the legendary Diezel VH4 amplifier, Works either as an overdrive effect or as an independent preamp, True Bypass, Independent ""To Power Amp In"" output is finely tuned for power amplifiers or serial effect loop inputs, In the preamp mode, the bypass switch will mute the signal, Controls: Gain 1, Master 1, Gain 2, Master 2, Bass, Middle, Treble, Deep, Presence, LED: Effect On / Off, Channel, Footswitch: Effect On / Off, Channel, Connections: input (6.3 mm jack), output (6.3 mm jack), 12-18 V DC power supply connection (coaxial socket 5.5 x 2.1 mm, negative pin inside), Power supply with a 12-18 V DC power supply (12 V DC power supply included), Dimensions (W x D x H): 114 x 165 x 51 mm, 18 V mains cable included (for 2x isolated 9V power supply outputs), Made in USA@+*Note: no battery operation possible.*