The MD356N-4-1 from Sinclair Technologies is a RF Duplexer with Frequency 380 to 400 MHz (5 MHz Seperation), Power 50 W, Insertion Loss 1.4 dB, Isolation 75 dB, Operating temperature -30 to 60 Degree C. Tags: Module with Connectors. More details for MD356N-4-1 can be seen below.