The 500-F203 from RH Laboratories is a RF Variable Attenuator with Frequency 2 to 18 GHz, Attenuation Step 1 dB, Attenuation Accuracy ±1 to ±1.5 dB (Flatness), Power 10 dBm, Insertion Loss 4 dB. Tags: Module with Connectors, Digital. More details for 500-F203 can be seen below.