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Your MR53 mount plate has the following features:
MR53 cable access bay
Mount plate attachment
slots (2x)
Access point
mounting posts (2x)
Desk mount feet (4x)
Cable access bay
AC Adapter plug (sold separately)
Power supplied by adapter: 12Vdc, 2.5A
Ethernet 0 port (10/100/1000)
Power supplied by PoE: 37-57 Vdc, 0.6A
Factory Reset Button
Various mounting holes