6 Signal Generators, Part Number (P/N) E8257D-520-UNT-UNU-1E1-1ED-1EM-1CP; National Stock Number (NSN) 6625-01-583-6234KV. 

Full part number (E8257D-520-UNT-UNU-1E1-1ED-1EM-1CP) option breakdown is as follows:
-This particular model measures a 20 GHz range
-AM, FM, Phase modulation, and LF output, generating analog modulated signals
-Contains a step attenuator which generates signals with output power levels –20 dBm (20, 31.8, and40 GHz models range 
from –135 dBmto their maximum power, and 50 and67 GHz models range from –110 dBm to their maximum power)
-Generates standard level RF output power (as opposed to high power signals)
-Generates standard spectral purity with low phase noise
-Has Type-N RF output connector
-Has option for all panel connectors to the rear panel
-Contains rackmount kit with front handles