Read:
http://www.djtechtools.com/2011/10/1...or-kontrol-s2/
And just to help direct you:
"USB BUS POWER VS. POWER ADAPTER
Just as with the S4, the S2 comes with an AC Adapter with a set of international plugs. AC power, however, is optional. You can run the S2 off of a fully powered USB 2.0 port. If you go that route, the LEDs dim down to what I consider a nearly unusable level, unless in darkness, and the headphone level drops slightly.
On the plus side, when I pulled the power cord out during use, the main audio output did not cut out at all, as it did for a couple of seconds with the S4. I could also hotplug the AC cord right back in with no disruption. This means the USB cable is your life line, and the robust USB port holds the cable stubbornly in place, much more strongly than your average printer."
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