TYN-300 USB External Digital Sound Adapter w/VoIP Handset - Listen to Music & Make Internet Calls via USB Port! TYN-300 USB External Digital Sound Adapter General Features: Color: Blue External USB sound adapter Works as a sound card device or VoIP device Includes regular phone handset to make Internet calls Speaker/Headphone/2.5mm Mobile Earpiece jacks Compatible with major PC to PC Internet phone application software LED indicator for power and linking status