The BM10040 from Bracke Manufacturing is a RF Variable Attenuator with Frequency DC to 750 MHz, Attenuation Range 0 to 65 dB, Attenuation Step 1, 2, 4, 8, 10, 20 dB, Attenuation Accuracy ±1.3 dB, Power 1 W. Tags: Module with Connectors, Toggle. More details for BM10040 can be seen below.