The VRFC0009-04-BD from VIPER RF is a RF Variable Attenuator with Frequency DC to 20 GHz, Attenuation Range 4.2 to 4.4 dB, Insertion Loss 1 dB, Supply Voltage -5 to 0 V, Input Return Loss -20 to -15 dB. Tags: Die, Digital. More details for VRFC0009-04-BD can be seen below.