DJ 4Set DJ Controller. This Hercules DJ4 Set DJ Controller with built-in audio combines the functions and feel of a pro controller with the simplicity you need to host memorable parties all night long. 4-channel operation provides one stereo out for the mix and another for previewing tracks on headphones. Features include a mic input with talk-over function, USB bus-powered operation, large touch-activated jog wheels, 2 deck controls with virtual control of 2 more, and switches to convert deck controls into MIDI commands. Backlights and well-spaced controls make this controller a pleasure to use Built-in audio 4-channel output: stereo line output for the mix, stereo headphone output for previewing tracks Microphone input: input with talk-over function No need to carry an audio interface Backlights and well-spaced controls make this controller a pleasure to use