The CER0127A from CTS Electronic Components is a RF Duplexer with Frequency 880 to 960 MHz, Band 1 925 to 960 MHz, Band 2 880 to 915 MHz, Power 2 to 20 W, Insertion Loss 4 to 4.2 dB. Tags: Ceramic, Surface Mount. More details for CER0127A can be seen below.