The KFF6636A from CTS Electronic Components is a RF Duplexer with Frequency 824 to 894 MHz, Band 1 869 to 894 MHz, Band 2 824 to 849 MHz, Power 3 W, Insertion Loss 2.6 to 3.5 dB. Tags: Ceramic, Surface Mount. More details for KFF6636A can be seen below.