The QDA-2000-4000-31.5-0.5 from Qualwave is a RF Variable Attenuator with Frequency 2 to 4 GHz, Attenuation Range 0 to 31.5 dB, Attenuation Accuracy ±0.5 dB, Power 0.3165 W, Insertion Loss 3.8 dB. Tags: Module with Connectors, Digital. More details for QDA-2000-4000-31.5-0.5 can be seen below.