The 5813-20A from ARRA Inc. is a RF Variable Attenuator with Frequency 5.4 to 5.9 GHz, Attenuation Range 20 dB, Power 5 W, Peak Power 64.77 dBm, Insertion Loss 0.5 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 5813-20A can be seen below.