The AV-3742 from RLC Electronics is a RF Variable Attenuator with Frequency 3.7 to 4.2 GHz, Attenuation Range 20 dB, Power 5 W, P1dB 37 dBm, Insertion Loss 0.5 dB. Tags: Module with Connectors, Continuously Variable, Rotary. More details for AV-3742 can be seen below.