The CER0829B from CTS Electronic Components is a RF Duplexer with Frequency 1.93 to 2.13 GHz, Band 1 2.12 to 2.13 GHz, Band 2 1.93 to 1.94 GHz, Power 2 to 20 W, Insertion Loss 3 dB. Tags: Ceramic, Surface Mount. More details for CER0829B can be seen below.