The 500-F209 from RH Laboratories is a RF Variable Attenuator with Frequency 4 to 6 GHz, Attenuation Step 1 dB, Attenuation Accuracy ±1 dB (Flatness), Power 10 mW, Insertion Loss 1.8 dB. Tags: Drop In, Digital. More details for 500-F209 can be seen below.