The SJ-T-2040-50D from A-Info is a RF Variable Attenuator with Frequency 2 to 4 GHz, Attenuation Range 0 to 50 dB, Attenuation Accuracy ±0.5 to ±2.5 dB, Power 0.5 W, Insertion Loss 1.5 dB. Tags: Module with Connectors, Current Controlled, Voltage Controlled. More details for SJ-T-2040-50D can be seen below.