25:
MIC1
is the Microphone input Jack.
26:
5V-IN
is DC5V input Jack.
27:
MIC2
is the Microphone input Jack.
28:
AUX-OUT
is audio output Jack.
29:
MIC3
is the Microphone input Jack.
30:
AUX-IN
is audio input Jack.
31: MIC4
is the Microphone input Jack.