?Monochrome 128*64 pixel dot-matrix graphic LCD ,Supports all kinds of languages ?12 classical 4-polyphonic ring tones catering to different tastes ?Skype Contact List, contact person info,Call List ,skype titles and time on LCD screen ?Rings loudly on an incoming call, Large LCD with white backlight ?Support skype,and skypespeed-dialing funtion ,Support SIP,H323,MGCP protocol ?With ring tones and Adjustable volume for earpiece and ringer ?Micmute button for privacy protection ?Plug-and-play,fully compatible with USB1.1 and USB2.0 ?Full-duplex communication,Support echo cancellation,noisse reduction ?USB interface PnP. No external power/sound card needed ?Also compatible with other PC-based softphone applications, such as MSN, Yahoo Message, QQ, Xten, Dialpad, MediaRing, Net2phone, etc