Detailed Product Description CDMA USB modem, CDMA 800Mhz wireless modem, CDMA modem - UC425 CDMA 800Mhz 2000 1x;Maximum Downlink Speed: 230.4 kbps;Maximum Uplink Speed: 230.4 kbps;Operating System: Windows 2000/XP/Vista.Dimension:92×34×12mm.Function: Voice,SMS,Data, Support for Multiple APN,SMS(send and receive),Dial-up networking