The 4-58M3-20 from ARRA Inc. is a RF Variable Attenuator with Frequency 3.7 to 4.2 GHz, Attenuation Range 20 dB, Attenuation Accuracy ±1 dB, Power 5 W, Peak Power 64.77 dBm. Tags: Module with Connectors, Continuously Variable, Rotary, Motorized. More details for 4-58M3-20 can be seen below.