The AD3237-3337D477 from Anatech Electronics is a RF Duplexer with Frequency 3212.5 to 3262.5 MHz / 3312.5 to 3362.5 MHz, Band 1 3212.5 to 3262.5 MHz, Band 2 3312.5 to 3362.5 MHz, Insertion Loss 1 dB, Isolation 40 dB. Tags: Module with Connectors. More details for AD3237-3337D477 can be seen below.