The CA21-20 from MCLI is a RF Variable Attenuator with Frequency 10.7 to 14.5 GHz, Attenuation Range 20 dB, Attenuation Accuracy 1 dB, Power 7 W, Peak Power 64.77 dBm. Tags: Module with Connectors, Continuously Variable, Rotary. More details for CA21-20 can be seen below.