... . Always on, always connected, CPU: Qualcomm MSM6280 2. Windows2000, Windows XP, Windows Vista, Win7... 4g usb wireless modem 1901C-21M Model No: 1901C ... MHz 3)Antenna Diversity Support Yes 4)Operating System Support: Windows 7, Windows Vista, Windows XP, Linux Ubuntu 9.04, Mac OS X 5 ...