The AE1877-1957DB2004 from Anatech Electronics is a RF Duplexer with Frequency 1.87 to 1.885 GHz / 1.95 to 1.965 GHz, Band 1 1.87 to 1.885 GHz, Band 2 1.95 to 1.965 GHz, Power 20 W, Insertion Loss 0.8 dB. Tags: Module with Connectors. More details for AE1877-1957DB2004 can be seen below.