The 50P-0531 from JFW Industries is a RF Variable Attenuator with Frequency DC to 1.5 GHz, Attenuation Range 127 dB, Attenuation Step 1 dB, Power 1 W, Insertion Loss 2.1 to 4.0 dB. Tags: Module with Connectors, Programmable, Digital, Computer Controlled. More details for 50P-0531 can be seen below.