The SJ-ST-500-2000-30-10 from A-Info is a RF Variable Attenuator with Frequency 0.5 to 2 GHz, Attenuation Range 30 dB, Attenuation Step 10 dB, Attenuation Accuracy ±1.5 dB, Power 1 W. Tags: Module with Connectors, Digital. More details for SJ-ST-500-2000-30-10 can be seen below.