The Strymon OJAI R30 is a very well crafted multiadapter for effects pedals. It has five isolated 9V outputs, two of which have selectable 9, 12, 18V voltages. The pure analog circuit with dual isolation (transformer for each channel) guarantees ultra-low noise. The OJAI can also be used as an expansion unit to the ZUMA adapter, or to power other units from it to create a modular power system.
Of course, a robust design is a must. It is supplied with mains cable and power cables.
The description was translated automatically