Spec: Qualcomm MSM6085/6800 chipset (ZIF) Supporting IS95A/B, CDMA20001X and CDMA2000 EVDO Data functions: Packet data, asynchronous data, bi-directional messaging Frequency band: 800/1900MHZ,GPSL1band(1575.42MHZ) Data sevice: Max. 3.1 Mbps downlink and 1.8Mbps uplink in CDMA1x EV-DOrA(IS-856-A) network; CDMA 1x RTT (IS-2000 Rel.0) Forward and reverse link speeds Max153.6 Kbps Receiver Sensitivity: under -106dBm (FER=0.5%) Supported OS: Windows98, Windows ME, Windows2000,Windows XP/Vista