Left to its own devices, Windows will normally choose the last USB audio device you plugged into your computer as the default audio device for your whole system. But you may want to use your USB phone for Skype audio only, while using your computer's speakers for music and other non-skype audio. We recommend specifically selecting the USB device(phone, adapter, headset) you want to use for Skype conversations, separate from your default Windows audio device(typically your sound card): In Windows --> Control Panel --> Sounds and Audio Devices --> Audio --> Sound playback, select your sound card as Default device.In Skype --> Tools --> Options --> Sound Devices, select "USB Audio Device" for Audio in and Audio out.For detailed instructions, see Skype Sound Device Settings(Windows).