The HLM-40U from Marki Microwave is a Power Limiter with Frequency DC to 40 GHz, Input Power P1 dB 15 dBm, Peak Input Power 43.01 dBm, Peak Input Power 20 W, Limited Output Power 36.02 dBm. Tags: Module with Connectors, Schottky Diode. More details for HLM-40U can be seen below.