Separate UIM card and compliant with the CDMA800MHZ/ 1900Mhz standard Supporting IS95A/ B, CDMA20001X and CDMA2000 EVDO Data functions: Packet data, asynchronous data, bi-directional messaging Working band: 800MHZ / 1900Mhz Data rate: Max. 2.4 Mbps downlink and 153 Kbps uplink in CDMA2000 EVDO network; Max. 153 Kbps downlink and 153 Kbps uplink in CDMA2000 1X network Power parameters: Working current < 700mA; sleep current < 50mA; working voltage 5VDC Working temperature: Storage temperature: -30° C ~ + 75° C; working temperature: -20° C ~ + 50° C Hardware interface: USB interface Supported OS: Windows98, Windows ME, Windows2000, Windows XP Dimensions: 88 × 54 × 5mm ( 38g)