The Pedal Power X4 Expander Kit adds four isolated 9V 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.