I want to DJ with rekordbox for iOS/Android. Do I need a USB power adapter or mobile battery?

Some devices may work with the unit without connecting a USB power adapter or mobile battery, but operation isn't guaranteed.
We recommend connecting a USB power adapter or mobile battery to the USB port (for power supply).
Make sure the USB power adapter or mobile battery has a maximum voltage of 24V or less and DC 9V 3A.
Other USB power adapters or mobile batteries, such as those with a DC 5V 500mA output, can't be used with the unit.