The 75P-153 from JFW Industries is a RF Variable Attenuator with Frequency 20 MHz to 1 GHz, Attenuation Range 63.5 dB, Attenuation Step 0.5 dB, Power 0.03 W, P1dB 15 dBm. Tags: Module with Connectors, Programmable, Digital, Computer Controlled. More details for 75P-153 can be seen below.