The 3953-3 from ARRA Inc. is a RF Variable Attenuator with Frequency 1 to 1.5 GHz, Attenuation Range 3 dB, Attenuation Accuracy ±0.5 dB, Power 5 W, Insertion Loss 0.2 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 3953-3 can be seen below.