3G EVDO Rev.O Modem 1. Chipset:MSM6500 2. Evdo:Download2.4Mbps 3. CDMA1X: Up to154Kbps 4. (CDMA1X):800MHZ (EVDO ):800MHZ 3G EVDO Rev. O ModemChipset:Qualcommmsm6500 Evdo:Download2.4M CDMA1X: Up to154Kbps Frequency support:(CDMA1X):800MHZ (EVDO ):800MHZ Support Voice-call ,SMS, phone bookSupport WIN XP, WIN2000, WIN7, vista32/64bit