iDream USB Phone for Skype™ and other VoIP applications. Supported network protocols: H.323, MGCP, SIP. Interface: USB 2.0. Weight: 55 g, Dimensions (WxDxH): 37 x 17 x 155 mm. Compatible operating systems: Windows 98SE/2000/XP, Minimum RAM: 64 MB, Minimum hard disk space: 100 MB