The 500-F204 from RH Laboratories is a RF Variable Attenuator with Frequency 0.5 to 8 GHz, Attenuation Step 1 dB, Attenuation Accuracy ±1 to ±1.5 dB (Flatness), Power 0 dBm, Insertion Loss 4 dB. Tags: Module with Connectors, Digital. More details for 500-F204 can be seen below.