The MDC001005R30B4 from Meuro Microwave is a RF Variable Attenuator with Frequency 100 to 500 MHz, Attenuation Range 0 to 30 dB, Attenuation Accuracy 0.3 dB, Power 0.5 W, Insertion Loss 1 dB. Tags: Module with Connectors, Drop In, Digital. More details for MDC001005R30B4 can be seen below.