From Voodoo Labs;

Pedal Power 4×4
is a linear (analog) power supply that can properly
power up to 4 digital power-hungry effects like those from Strymon,
Eventide, Line 6, TC Electronic and more, plus 4 standard 9-volt battery
stompboxes. Perfect for large pedalboards, Pedal Power 4×4 features 8
completely isolated, filtered, and regulated output sections that will
keep your pedals dead quiet and free from high-frequency noise that
occurs with digital “switching” power supplies.

Pedal Power 4×4 features an internal thermometer that controls a
silent fan keeping the unit cool even under the most adverse heat
conditions of outdoor festival stages. Even with poor AC line
conditions, it delivers clean, consistent power. Handmade in the USA
using the finest components, Pedal Power 4×4 was designed to meet and
exceed the needs of our most demanding professional users.