The 1953-3X from ARRA Inc. is a RF Variable Attenuator with Frequency 350 to 500 MHz, Attenuation Range 3 dB, Attenuation Accuracy ±0.5 dB, Power 5 W, Insertion Loss 0.2 dB. Tags: Module with Connectors, Continuously Variable, Rotary. More details for 1953-3X can be seen below.