The SJ-T-510-50D from A-Info is a RF Variable Attenuator with Frequency 500 MHz to 1 GHz, Attenuation Range 0 to 50 dB, Attenuation Accuracy ±0.4 to ±2 dB, Power 0.5 W, Insertion Loss 1 dB. Tags: Module with Connectors, Current Controlled. More details for SJ-T-510-50D can be seen below.