The QDA-18000-40000-31.5-0.5 from Qualwave is a RF Variable Attenuator with Frequency 18 to 40 GHz, Attenuation Range 0 to 31.5 dB, Attenuation Accuracy 0 to 1.89 dB (±6 %), Power 0.5 W, Insertion Loss 8 dB. Tags: Module with Connectors, Digital. More details for QDA-18000-40000-31.5-0.5 can be seen below.