The HLM-40U from Marki Microwave is a Limiter with Frequency DC to 40 GHz, Flat Leakage 0.06 W, Flat Leakage 18 dBm, Input Power 36.02 dBm, Input Power 4 W. Tags: Module with Connectors, PIN-Schottky Diode. More details for HLM-40U can be seen below.