The 3843-20A from ARRA Inc. is a RF Variable Attenuator with Frequency 1.25 to 1.35 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 3843-20A can be seen below.