The 5953-3 from ARRA Inc. is a RF Variable Attenuator with Frequency 4.2 to 4.4 GHz, Attenuation Range 3 dB, Attenuation Accuracy ±0.2 dB, Power 5 W, Insertion Loss 0.3 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 5953-3 can be seen below.