US Robotics USB Internet SpeakerPhone. Interface: USB 1.1/2.0. Weight: 100 g, Dimensions (WxDxH): 123 x 45 x 24 mm. Compatible operating systems: Microsoft Windows 2000, Windows XP, Macintosh OSX, Minimum RAM: 32 MB, Minimum hard disk space: 10 MB. Operating temperature range (T-T): 0 - 50 °C, Storage temperature range (T-T): -20 - 70 °C. Safety: UL, CUL, CE Class B, Certification: FCC Class B RoHS