Motorola avigilon 30L-H4PRO-B Installation Manual page 8

Provides information about device operation. For more information, see
Indicator on page 13.
7. Audio I/O connector
Accepts a mini-jack connector (3.5 mm).
8. Serial number tag
Device information, product serial number and part number label.
9. I/O connector block
Provides connections to external input/output devices.
Rear View
Connection Status LED
3