3g modem frequency band 3g 800mhz 3g 850mhz 3g 900mhz 3g 1900mhz 3g 2100mhz 2g 850mhz 2g 900mhz 2g 1800mhz 2g 1900mhz max upload speed 576 mbps download speed max 21 mbps power supply on motherboard status indicator led operating system windows xp windows vista windows 7 windows 81 interface mini pci express data transfers edge umts hspa hspa gprs gsm