1.Free PC: With LCD dot matrix display, all the Skype titles such as Contacts, Dial, Call list could be read on it and could be operated using the keypad; 2.Support 10 types of languages displaying, such as Chinese, Simplified Chinese, English, German, France, Japanese, Korean language and so on. 3.With back light, much clearer; 4.With ringer, rings able and volume adjustable; 5.PC-to-PC and PC-to-phone operation ; 6.Driver built-in, plug and play; 7.USB2.0 compatible; 8.No sound card needed; 9.No external power required plies with H.323, MGCP, SIP protocol; 11.Echo cancellation, noise reduction; 12.Application support: Skype, and support Skype speed-dialing function; 13.Full duplex communication; 14.Key-in tone function