Sony DUALSHOCK 4 - Mono Headset and PlayStation Camera; Mono Headset Description; PlayStation Camera Features

A )
Earpiece
B )
Microphone
C )
MIC switch
D )
Clip
 When you're using the microphone, you should attach the clip to your clothing.
PlayStation®Camera
Use the PlayStation®Camera to play camera-enabled games. You can also log in to your PS4™
system using face recognition.