Pruthvik™ USB External Stereo Sound Adapter, Costech [Updated Version] Virtual 7.1 Channel Double USB Microphone & Headset Port Plug and Play No Drivers Needed for Windows, Mac, Linux Brand : Pruthvik Enterprise   Color : Black    Product Description:   Dual headphone and microphone interfaces.   Two little LED lights to display working stations.   The microphone recording function.   Karaoke function.  Dynamic rotating sound field.   Multichannel technology to realize the 7.1 channel of dynamic sound.   Speaker and headphone mode switch function freedom.   Simulation speaker position free adjustment function.   Sound Mixer function.   Output level adjustment.  Put analog signal (microphone and CD, MP3, TV, radio line signal etc) into digital signals and preserve function.   Real USB Plug & Play.   Drive 2CH speakers Directly & support 3D positional sound and virtual 5.1 CH sound track.   Use USB port power Directly.   External power adapter NO NEED.   Support the common speakers or headset, with two pairs of microphone holes.   Function keys: Microphone mute, speaker, mute, volume, volume down.   Speaker and headphone mode switch function freedom.   Simulation speaker position free adjustment function.  volume adjust buttons, convenient to control volume.  Double mute switch button: the microphone mute buttons and sound output mute buttons.   Lovable with special appearance.    Warranty:   2 Year Warranty with Pruthvik Enterprise