MDS 2310A 914/960 Mhz microwave radio data transceiver
Industrial "Microwave Data Systems - MDS 2310A HL Data Transceiver". This is marked "Model 2310RA1B114F0A" and "FCC ID: E5M5LL1755" and is rated for 13.8 VDC 2.5 A. We hooked this up to 12VDC and it seems to power up.
This is from the estate of an industrial communications engineer and ham / shortwave radio enthusiast. We don't know much about this. It has some wear to the case and have not tested it