The CER0569D from CTS Electronic Components is a RF Duplexer with Frequency 1.71 to 2.18 GHz, Band 1 2.11 to 2.18 GHz, Band 2 1.71 to 1.78 GHz, Power 2 W, Insertion Loss 2 dB. Tags: Ceramic, Surface Mount. More details for CER0569D can be seen below.