The 2-3954-90 from ARRA Inc. is a RF Variable Attenuator with Frequency 960 MHz to 1.215 GHz, Attenuation Range 90 dB, Attenuation Accuracy ±0.5 dB, Power 5 W, Insertion Loss 1.5 to 6 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 2-3954-90 can be seen below.