The 3491-80 from KRATOS General Microwave is a RF Variable Attenuator with Frequency 0.75 to 2.25 GHz, Attenuation Range 80 dB, Attenuation Step 0.25 dB, Power 0.01 W, Insertion Loss 1.7 dB. Tags: Module with Connectors, Programmable, Digital. More details for 3491-80 can be seen below.