The QCA50 from Qualwave is a RF Variable Attenuator with Frequency 0.9 to 4 GHz, Attenuation Range 0 to 10 dB, Attenuation Accuracy ±0.5 dB, Power 50 W, Insertion Loss 1 dB. Tags: Module with Connectors, Continuously Variable. More details for QCA50 can be seen below.