U disk VOIP phone is a USB phone embedded with memory drive. Once you plug it into the PC, the softphone stored in memory drive will auto run without any additional installation, log in the account automatically, and then you can make VOIP calls freely. The VOIP services provider can use software tools from FreeTalk to make their softphone (such as SKYPE, the NEUF telecommunication etc) into U disk VOIP phone according to their own requirements. Feature Size:78*28*11mm (length*width*height) Metal covering Compatible USB 1.1,2.0 Sound IC built-in Support flash size:64/128/256/512/1024MB No need external power supply Support Win 98SE/Win ME/Win 2000/Win XP/Win 2003 Servers, the system above Win98 does not need to install the driver.