The AT-A000-HD from UMCC is a RF Variable Attenuator with Frequency 250 to 500 MHz, Attenuation Range 0 to 60 dB, Attenuation Step 0.25 dB, Power 1 W, P1dB 30 dBm. Tags: Module with Connectors, Programmable, Digital, Computer Controlled. More details for AT-A000-HD can be seen below.