This is a uni-network modular cable tester by Milestek.
It includes a black case which contains the Uni-Network Modular Cable Tester and the Remote Terminator.
The cable tester measures about 4" long and 2.5" wide. The remote terminator measures about 4" long and 1.25" wide.
Overall, this is in good pre-owned condition. They have not been tested and are being sold as-is.