Virtual 7.1 USB Stereo External Sound Card (Black) for Hp laptop . Virtual 7.1 USB Stereo External Sound Card for you to connect headphones or speakers, and a microphone to your computer without the need to unplug other devices!Features:Compliant with USB 2.0 and USB audio device specification 1.0, this USB to audio adapter couldn't be any simpler to install. Add a virtual 7.1 channel sound to your PC. Turn your stereo speaker / earphones into 7.1 channel environment. Compatible with both Desktop or laptop Notebook. Specification USB2.0 Full-Speed (12Mbps) Specification USB HID Class Specification 1.1 USB Audio Device Class Specification 1.0USB bus-power, no external power required! Connectors: USB Type A, Stereo output jack, mono microphone input jack Xear 3D virtual 7.1 channel sound simulation software for XP / Vista is included Functions keys: Microphone-Mute, Speaker-Mute, Volume-Up and Volume-Down LED indicators: Microphone-Mute Status, Activity Plug and Play. System Requirement Desktop or notebook PC with a USB port. Stereo active speaker or stereo earphone. Xear3D (Virtual 7.1 channel sound simulation software) Compatible with: Windows 2000, Server 2003, XP, Vista, Windows 7.Compatible With Hp Pavilion dv7 Pavilion dv6000 Pavilion dv6 Pavilion dv4 G60 G62 Pavilion dm4 EliteBook 8440p G72 Pavilion dv9000 Pavilion dv5 EliteBook 2540p ProBook 4520s Mini 110 EliteBook 6930p Envy 14 Mini 210 Compaq nc6400 G71 Mini 1000 620 EliteBook 8540w Envy 17 Pavilion dm1 ProBook 6450b Compaq 6720s 530 Compaq 6910p TouchSmart tx2 G61 Compaq nx7400 Pavilion dv2000 Compaq nc6000 Envy 17 3D ProBook 4510s EliteBook 2740p OmniBook 4150 Pavilion dv8000 Compaq nx6110 Pavilion g6s Pavilion dv3 ProBook 6550b TouchSmart tm2t EliteBook 2530p Compaq 6710b Pavilion dm3 Compaq nc6220 Pavilion zv6000 Pavilion dv1000 Compaq 6510b Compaq nx9030 Compaq nx9420 Compaq 2510p Compaq nc6120 Compaq 6820s Compaq 8710w Compaq 6730s 625 TouchSmart tm2 EliteBook 8540p Envy 15 Compaq nc6320 Compaq 6830s