The F4-5684-100 from ARRA Inc. is a RF Variable Attenuator with Frequency 3.9 to 4.1 GHz, Attenuation Range 100 dB, Power 10 W, Peak Power 66.99 dBm, Insertion Loss 2 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for F4-5684-100 can be seen below.