The 38M3-20A from ARRA Inc. is a RF Variable Attenuator with Frequency 1.25 to 1.35 GHz, Attenuation Range 20 dB, Attenuation Accuracy ±0.5 dB, Power 5 W, Peak Power 64.77 dBm. Tags: Module with Connectors, Continuously Variable, Rotary, Motorized. More details for 38M3-20A can be seen below.