The UPD004A from CTS Electronic Components is a RF Duplexer with Frequency 1.71 to 2.16 GHz, Band 1 2.11 to 2.16 GHz, Band 2 1.71 to 1.76 GHz, Power 1.5 to 15 W, Insertion Loss 1.4 dB. Tags: Ceramic, Surface Mount. More details for UPD004A can be seen below.