Support PC to PC and PC to Phone dial, all the VoIP software such as (Skype, MSN messenger and Yahoo Messenger) with Screen display. Built-in speaker and microphone, USB port support both input and output voice at same time. Easy to operate: Standard phone's number pad, also adds 6 more function keys above the number pad. The 4 function keys on the side allow you to control the volume up/down/mute and record. Built-in hot-key function to operate Skype as easy as dialing a normal telephone. Advanced digital USB streaming audio provides excellent clarity with the simplicity of a single USB plug-and-ready connection. Recordable: allows you to record your own voice, and able to play recorded WAV files with crystal clear sound. Compliant: with USB 2.0 Full Speed Operation Compliant: with USB Audio Device class specification v1.0 Volume up and down that support USB HID for Host Control Synchronization Embedded High Performance 16 bit audio DAC with Earphone Phone Buffer Embedded 16 bit ADC input with Microphone Boost Requirement Package Contents PC running Windows 2000 or XP. 400 MHz processor 128 MB RAM 100 MB free disk space on your hard drive Internet Connection (either dial-up: minimum 33.6 Kbps modem, or any broadband: cable, DSL, etc.)