The CER0678A from CTS Electronic Components is a RF Duplexer with Frequency 1.74 to 1.88 GHz, Band 1 1.84 to 1.88 GHz, Band 2 1.74 to 1.79 GHz, Power 5 W, Insertion Loss 2.2 to 2.3 dB. Tags: Ceramic, Surface Mount. More details for CER0678A can be seen below.