What do I need other than the DDJ-WeGO2 for DJ performances?

Please prepare the following devices:

[When using a computer]

- A computer

- Powered speakers (or an amplifier and speakers)

- Headphones

- A microphone as well if required

[When using an iPad/iPhone/iPod touch]

- An iPad/iPhone/iPod touch where djay2/ｖｊａｙ for iPad/iPhone is installed

- An USB mobile battery charger or an USB power adapter (DC5V/500mA or greater)

- Powered speakers (or an amplifier and speakers)

- Headphones

- A microphone as well if required