1. USB Interface PnP. No external power/sound card required
2. High quality for full duplex communication
3. With phone base and hook ability
4. Built-in keypad for DTMF dialing, rings on an incoming call
Specifications
1. Physical Connectors  One USB Port
2. Keypad  DTMF keys 0~9, #, *, 4 soft defined function keys
3. LED  For connection/status
4. LCD  LCD for call messages/status
5. Cabling  USB B-type connecor
6. Standard Support: Compliant with USB V 2.0
Compliant with USB Audio Device Class Spec V 1.0
Compliant with USB HID Version 2.0
7. Operating Humidity  5%-95% RH
8. Operating Temperature  0 ~40 degree
System Requirements
1. Pentium MMX 300MHz or above, with USB Interface, minimum 128MB RAM or more  
2. Broadband or 56Kbps analog
3. Microsoft Windows 98/2000/XP operating system.