The Focusrite Scarlett 2i4 is a 2 in / 4 out USB recording interface.
Scarlett 2i4 has four outputs and a separate headphone socket so you can connect it to speakers and send a separate signal to a recording musician.
If you are DJing with a laptop you can send one stereo signal to the mixer and cue up your next track on headphones via the other stereo channel. 2i4 also has MIDI in /out ports which will allow you to connect your MIDI keyboard or digital piano to your music software.
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