From Strymons’ Website- ”
Zuma R300 is the highest horsepower, most technologically advanced
low profile effects pedal power supply. You get clean, rock-steady power
for your 9V, 12V and 18V effects pedals in a pedalboard friendly,
expandable package, giving you room to grow. Zuma R300s ultra-low
profile design means that it can fit under just about any pedalboard.

Dual-stage topology, pre-regulated outputs, optically isolated
feedback, and advanced multistage filtering result in a power supply
that allows your pedals to achieve their highest possible dynamic range.”