The 2-3953-30X from ARRA Inc. is a RF Variable Attenuator with Frequency 960 MHz to 1.215 GHz, Attenuation Range 30 dB, Attenuation Accuracy ±0.3 dB, Power 1 W, Insertion Loss 3.5 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 2-3953-30X can be seen below.