System Requirement：
  - Win 2000 & Win XP OS
  - Pentium 400 MHz and above
  - 32 MB memory
  - 20 MB hard disc
  - Any internet connection (LAN, ADSL, Modem, Cable Modem) to internet with 56K bps and above
  Features
  1. Convenient USB interface without power supply and sound card
  2. Easily handled by hand
  3. 16 bit call guaranteed by dual communication
  4. long-distance telephone of high quality with low cost
  5. The same operating way to traditional phones
  6. Compatible with various softphone software like Skype, MSN Messenger,SJ PHONE
  7. Flexibility, various USB phone can be installed in one computer at the same time with any conflict
  8. Long-distance call of low cost used with PSTN network