Microphone - NEC VERSA DOCKING STATION 4000 Manual

The following figure identifies the audio ports on the back
of the docking station.
Docking station audio ports

Microphone

For the best results, NEC recommends that you use an
omnidirectional monaural microphone that has an electric
condenser. (See Appendix A, Specifications, for
recommended microphone specifications.)
To connect a microphone to the docking station, insert the
microphone jack into the microphone port.
Connecting Peripheral Devices 5-7