Pack includes Presonus AudioBox 22VSL 2x2 USB 2.0 Audio Interface XLR Cable, Instrument Cable, Headphones, and Polishing Cloth. The AudioBox 22VSL introduces a new generation of PreSonus USB 2.0 audio/MIDI interfaces that take hardware/software integration to the logical next step. Using your computer CPU and PreSonus Virtual StudioLive (VSL) software, AudioBox VSL-series interfaces provide reverb and and delay effects and the same Fat Channel compression, limiting, semi-parametric EQ, and high-pass filter, as the PreSonus StudioLive 16.0.2 digital mixer -- all with inaudible latency. Now you can monitor and record with or without real-time dynamics processing and EQ! What"s so great about effects and processing on monitors? Tracking without hearing effects and signal processing is like playing a video game with your eyes closed. Musicians rely on aural cues when performing, and their performance can vary depending on what they hear in their monitors. Adding just the right amount of compression, EQ, and reverb can make a huge difference in their ability to hear themselves clearly and to experience their performance as if it occurred in a natural space rather than in the artificial sonic environment of the studio. The result is a better performance and ultimately a better recording.