The HLM-20BH from Marki Microwave is a Power Limiter with Frequency DC to 20 GHz, Input Power 30 dBm (IP3), Limited Output Power 36.02 dBm, Limited Output Power 4 W, Insertion Loss 1 dB. Tags: Module with Connectors, Schottky Diode. More details for HLM-20BH can be seen below.