The 4953-3Y from ARRA Inc. is a RF Variable Attenuator with Frequency 2.9 to 3.1 GHz, Attenuation Range 3 dB, Attenuation Accuracy ±0.3 dB, Power 5 W, Insertion Loss 0.3 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 4953-3Y can be seen below.