NEC MultiSync M491 49" Class HDR 4K UHD Commercial IPS LED Display - Manual (Page 27)

English−23
K RS-232C IN (D-Sub 9-pin)
Connect RS-232C input from external equipment, such
as a computer, in order to control RS-232C functions.
See
page 52 .
L Internal Speaker
M Handle
Two for M431, M491, and M551.
Four for M651.
N Security Slot
Security and theft protection lock slot compatible with
Kensington security cables/equipment.
NOTEN:
For products, visit Kensington’s website.
O Label