The 3491H-64 from KRATOS General Microwave is a RF Variable Attenuator with Frequency 0.75 to 2.25 GHz, Attenuation Range 64 dB, Attenuation Step 0.25 dB, Power 0.001 W, Insertion Loss 1.6 to 1.7 dB. Tags: Module with Connectors, Programmable, Digital. More details for 3491H-64 can be seen below.