The Pedal Power X4-18V Expander Kit adds two 9V and two 18V isolated DC outputs to compatible Voodoo Lab power supplies. Its ultra-compact size makes adding on to your existing system quick and easy, mounting to the even most space-challenged pedalboards. The innovative hybrid DC transformer design of Pedal Power X4 combines exotic components, linear regulation, and computer optimized filtering to establish industry-leading audiophile quality power that unveils the hidden sonic potential of your rig.