The CER0787B from CTS Electronic Components is a RF Duplexer with Frequency 2.5 to 2.69 GHz, Band 1 2.62 to 2.69 GHz, Band 2 2.5 to 2.57 GHz, Power 3 W, Insertion Loss 2 to 2.2 dB. Tags: Ceramic, Surface Mount. More details for CER0787B can be seen below.