The AD440-458D393 from Anatech Electronics is a RF Duplexer with Frequency 438 to 442 MHz / 455 to 462 MHz, Band 1 438 to 442 MHz, Band 2 455 to 462 MHz, Insertion Loss 1 dB, Isolation 60 dB. Tags: Module with Connectors. More details for AD440-458D393 can be seen below.