The 4-5853-20 from ARRA Inc. is a RF Variable Attenuator with Frequency 2.9 to 4.3 GHz, Attenuation Range 20 dB, Power 5 W, Peak Power 64.77 dBm, Insertion Loss 0.5 dB. Tags: Module with Connectors, Continuously Variable. More details for 4-5853-20 can be seen below.