The 4205A-63.5 from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency 0.3 to 6000 MHz, Attenuation Range 0 to 63.75 dB, Power 0.2 to 0.63 W, IIP3 56 dBm, Insertion Loss 2.8 to 6.5 dB. Tags: Module with Connectors, Programmable, Digital. More details for 4205A-63.5 can be seen below.