1. Tri-band EGSM 900 and DCS 1800/1900. 2. GPRS class B, multi-slot class 10. 3. Compliant to GSM phase 2/2+. 4. Operating system : Windows 98/Me/2000/XP, CE3.0,Pocket PC 2002/2003. 5. Dialer software for Voice and SMS two-way communication. 6. External headset for audio input/output. 7. LED indicator for GSM/GPRS operating status and Battery status. 8. Including rechargeable 650mA Li-Lon Battery. 9. Compact Flash Interface.