The CER0687A from CTS Electronic Components is a RF Duplexer with Frequency 746 to 787 MHz, Band 1 746 to 757 MHz, Band 2 776 to 787 MHz, Power 3 W, Insertion Loss 3.5 to 3.8 dB. Tags: Ceramic, Surface Mount. More details for CER0687A can be seen below.