OptionWireless Option AT&T USB Connect Quicksilver GSM/HSPA/EDGE/GPRS class 12 USB USB Dongle AT&T Option Wireless (ATT Branded) 3G GSM USB Cellular Modem 3G GSM Modem at a 2G GSM Price! Frequency: GSM/HSPA/EDGE/GPRS class 12 Dim: 66mm L x 25mm W x 17mm H Operating system: Microsoft Windows Vista, XP and 2000 (plug-and-play) , Mac OS X (version 10.4.3 or later)