RRJ31XSET/CMD DUAL RJ31X JACK W/ 3' CORD
The RRJ31X-SET/CDM is a Block & Cord Kit that interfaces between a digital communicator and the telephone line.
The cord has an RJ31X connector on each end.

50 Microns of gold on pins
3-ft. cord
Meets FCC Part 68
UL Listed Communication Circuit Accessory