You get what is shown in the photos.
Product Description
Model: AT-210T
Twisted Pair Transceiver
IEEE 802.3 10 Base T
(MAU)
Ethernet Compatible
Power: 12VDC, 300MA MAX.
Class II Equipment
705-10777-04 REV. A
15 Pin
Date Code: F2E06060L
RJ45 to 25-pin connector