We do not include a power supply to reduce e-waste and shipping costs, and because many of our customers already use multi-outlet guitar pedal power supplies.
Any 9V center negative (Boss-style) regulated power supply that can provide enough current will work with our pedals. The plug should have 2.1mm inside diameter and 5.5mm outside diameter. This is the type of power supply used by almost all guitar pedals, and we recommend using one designed specifically for effects. If you have a few pedals, we recommend a multi-pedal power supply with independent regulated outputs (not daisy chained).
For detailed information about power supplies see this article: