USB Voip Phone with Dot-matrix LCD Feature: Free from PC : with LCD dot matrix display , can display skype titles , contacts, dial and call list and could be operated using the keypad. Supports 10 types of languages displaying Chinese, simplified Chinese, English, German, France, Janpanese, Korean With blue backlight With ring tones and adjustable volume PC-to-PC and PC-to-Phone operation Plug-and-play Fully compatible with USB 1.1 and USB 2.0 No need for sound card External power not required Supports Skype, and Skype speed-dialing function Full duples communication USB Audio Device class specification 1.0 compatible Support windows 98SE/Windows ME,2000,XP Recommend system requirements: Windows XP or 2K OS, 400MHz or above CPU, 128MB or above main memory, 15MB free HDD space. Broadband internet connction: ADSL or Cable modem Dimensions : 150mm*20mm*38mm(L*H*W)