The F4684-50A from ARRA Inc. is a RF Variable Attenuator with Frequency 3.8 to 4 GHz, Attenuation Range 50 dB, Power 10 W, Peak Power 66.99 dBm, Insertion Loss 1.5 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for F4684-50A can be seen below.