Features: 1) Fully functional keypad and LCD screen enables you to make / receive calls without using keyboard and mouse 2) 12 classical 4-polyphonic ring tones catering to different tastes 3) Acoustically isolated speaker and microphone to eliminate echo 4) Full-duplex communication with crystal clear speech 5) USB interface PnP. No external power / sound card required 6) Power LED and Status LED 7) Mic. mute button to protect your privacy 8) Streamlined and fashionable design similar to a mobile phone 9) Also compatible with other PC-based soft phone applications, such as MSN, Yahoo Message, Xten, Dialpad, MediaRing, Net2phone 10) Earphone supplied for handsfree operation Host system requirements: 1) Microsoft Windows2000 / XP / Vista 2) Pentium 400MHz above processor / 128MB RAM / 16 MB free hard disk capacity 3) One USB port available 4) Internet connection (ADSL, cable modem, Dial-UP, wireless LAN)