The QDA-500-18000-63.75-0.25 from Qualwave is a RF Variable Attenuator with Frequency 0.5 to 18 GHz, Attenuation Range 0 to 63.75 dB, Attenuation Accuracy ±0.4 to ±1.5 dB, Power 0.31 W, Insertion Loss 7.5 dB. Tags: Module with Connectors, Digital. More details for QDA-500-18000-63.75-0.25 can be seen below.