The F4-5684-30A from ARRA Inc. is a RF Variable Attenuator with Frequency 3.9 to 4.2 GHz, Attenuation Range 30 dB, Power 10 W, Peak Power 66.99 dBm, Insertion Loss 1.5 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for F4-5684-30A can be seen below.