You can plug a Microphone to your D3s.
1/ The best microphone we have tested is the Rode VideoMic or VideoMic Pro
2/ Also you will need a 5 meters female to male 3.5mm jack extension cord and a small tripod to be able to move this microphone.
3/ You have to tune your D3s sound recording level to the minimum.
This is the Microphone installed on a press conference desk Siwtched "ON" or to decrease sensitivity (noisy room...)
The cord: