Features: Reproduces a realistic 5.1 channel listening experience from any set of headphones. Advanced digital signal processing recreates the dynamics and natural sound cues of a precisely placed 5.1 channel speaker system. Reproduces 5.1 channel listening experience from any stereo source when combined with Dolby Pro Logic II technology. Benefits: Enjoy 5.1 channel encoded content without disturbing others. Improves listener comfort and reduced "listener fatigue". Ideal for travelers, late night movie viewers, or anyone without a surround speaker system.