StarTech.com 4 Channel Low Profile PCI Sound Adapter Card AC97 3D Audio Effects Sound Cards PCISOUND4LP Hardware 4-channel audio outputs and support for EAX environmental audio extensions Backed by a StarTech.com 2-year warranty and free lifetime technical support 4 channel audio output via 3.5mm mini-jacks Support for EAX, Karaoke Key and Echoing Built-in 32 Ohm earphone buffer. Operating Systems: Windows 2000/ XP(32/64bit)/ Server 2003(32/64bit)/ Vista(32/64bit)/ 7(32/64bit)/ Server 2008 R2, and Linux