US Robotics USB Internet Mini Phone. Interface: USB 2.0. Weight: 0.2 kg, Dimensions (WxDxH): 150 x 44.5 x 20.3 mm. Compatible operating systems: Windows XP/2000, Minimum system requirements: CD-ROM Skype software, Minimum RAM: 128 MB. Operating temperature range (T-T): 0 - 50 °C, Storage temperature range (T-T): -20 - 70 °C, Operating relative humidity range: 20 - 80 %