These units come without external power supplies.

The Pivitec e32 Personal Mixer bundle comes with a set of 3 mixers and an eRack kit, but no power supply. To use, connect your audio sources to the mixer. Since there's no power supply, make sure your audio sources can power the mixer. When not in use, store it in a dry and cool place. Clean it regularly with a soft, dry cloth. Don't expose it to water or extreme temperatures. And always handle it gently to avoid any damage.