The F4684-40 from ARRA Inc. is a RF Variable Attenuator with Frequency 3.7 to 4.2 GHz, Attenuation Range 40 dB, Power 10 W, Peak Power 66.99 dBm, Insertion Loss 1.5 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for F4684-40 can be seen below.