Preintall driver. Memory: 2M-2G optional OEM logo, color, balance display, Pop Up window Preintall desktop SIP phone, OEM available, show logo, show balance 1. USB Interface PnP. No external power/sound card required2. High quality for full duplex communication3. With phone base and hook ability4. Built-in keypad for DTMF dialing, rings on an incoming call.5. Support Skype, UUcall, Alt, QQ, MSN, ...