The 3953-30Z from ARRA Inc. is a RF Variable Attenuator with Frequency 1.0 to 2 GHz, Attenuation Range 30 dB, Attenuation Accuracy ±1.5 dB, Power 1 W, Insertion Loss 3.5 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 3953-30Z can be seen below.