The 500-F201 from RH Laboratories is a RF Variable Attenuator with Frequency 12 to 18 GHz, Attenuation Accuracy ±1 dB (Flatness), Power 0 dBm, Insertion Loss 3.5 dB, Switching Time 1 us. Tags: Module with Connectors, Voltage Controlled. More details for 500-F201 can be seen below.