The 3499 from KRATOS General Microwave is a RF Variable Attenuator with Frequency 18 to 40 GHz, Attenuation Range 50 dB, Attenuation Step 0.03 dB, Power 0.01 W, Insertion Loss 4.1 to 5.2 dB. Tags: Module with Connectors, Programmable, Digital. More details for 3499 can be seen below.