... , color, balance display, Pop Up window Preintall desktop SIP phone, OEM available, show logo, show balance 1. USB Interface PnP. No ... duplex communication3. With phone base and hook ability4. Built-in keypad for DTMF dialing, rings on an incoming call.5. Support ... ; 6. Free-hand function.Specifications1.Physical Connectors: One USB Port2. Keypad: DTMF keys 0~9, #,*,4 soft defined function keys3. LED ...