US Robotics Cordless Skype Dual Phone. Display: LCD, Display number of colours: Monochrome. Interface: USB 2.0. Dimensions (WxDxH): 154 x 48 x 28 mm. Package dimensions (WxDxH): 190.5 x 174.8 x 47.8 mm. Compatible operating systems: Windows XP/2000, Minimum system requirements: CD-ROM, Minimum RAM: 128 MB