The whole kit is powered by a battery pack. I have 2. The lightest pack has a 12V output (+ tip) and a 5V USB. This allows me to run the lunchbox modular on 12v and then I can run the #korg #sq1 sequencer or the #tascam digital recorder or the #arturia #keystep from the USB. Or, using my USB to -9v cable, I can run a multieffect #guitar #pedal like a #zoom #ms70cdr (or any of the other 9v (-tip) pedals I have).

The 12V plug here is 5521, lunchbox is 5521 (& guitar pedals also 5521 but 9v -tip)