Feature: ? USB 2.0 support ? 16 bit sound card inside ? no driver needed for Win98 SE/Win ME/ Win 2000/Win XP/ Mac OS/Mac OS X ? HID support ? Adjustable volume for handset ? Ring incall ? 128?45?19 mm (L ? W ? H) Support Software phone： SJ Phone specially develop the program of USB Dialer to match our TW-VS200 ORDERING INFORMATION TW-VT100 Broadband VOIP Phone(two ports) TW-VG100 Voice Gateway (one ports) TW-VG200 Voice Gateway (two ports) TW-VG400 Voice Gateway (four ports) TW-VS100 Skype USB Gateway TW-VS200 Skype Phone TW-VS300 Skype Phone（LCD）