The 3953-3Z from ARRA Inc. is a RF Variable Attenuator with Frequency 1 to 2 GHz, Attenuation Range 3 dB, Attenuation Accuracy ±1 dB, Power 5 W, Insertion Loss 0.2 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 3953-3Z can be seen below.