Sony CUH-1216A PlayStation 4 Quick Start Manual page 14

Using the mono headset
Connect the mono headset to your controller for in-game voice
chat.
Mono headset
Microphone
MIC switch
Clip
Stereo headset jack
Using multiple controllers
You can use up to 4 controllers at the same time.
When you press the (PS) button on a controller for which
registration has been completed, a colour will be assigned to that
user and the light bar will light up in their own colour, depending
on the order in which they join in. The first user is blue, the second
is red, the third is green and the fourth is pink.
14