The AE1957-2127DB5423 from Anatech Electronics is a RF Duplexer with Frequency 1.95 to 1.965 GHz / 2.12 to 2.135 GHz, Band 1 1.95 to 1.965 GHz, Band 2 2.12 to 2.135 GHz, Power 25 W, Insertion Loss 0.7 dB. Tags: Module with Connectors. More details for AE1957-2127DB5423 can be seen below.