The QCA10-0.5-4-20 from Qualwave is a RF Variable Attenuator with Frequency 0.5 to 4 GHz, Attenuation Range 0 to 20 dB, Power 10 W, Insertion Loss 0.5 dB, Operating Temperature -40 to 65 Degree C. Tags: Module with Connectors, Continuously Variable. More details for QCA10-0.5-4-20 can be seen below.