1.LCD dot-matrix display 2.Display Skype titles, contacts, dial and call list 3.PC-to-PC and PC-to-phone operation 4.Full duplex communication 5.Receive/dial and ring out button 6.Volume control and Mute button 7.Number key 8.Ring tone option 9.With backlight 10.Plug-and-play 11.Supports universal types of languages 12.Supports echo cancellation, noise reduction 13.Supports Skype, and Skype speed-dialing function 14.USB audio device class specification 1.0 compatible 15.Fully compatible with USB 1.1 and USB 2.0 16.No sound card is needed 17.External power is not required