The 921-856-811 from Innowave RF is a RF Duplexer with Frequency 851 to 861 MHz / 806 to 824 MHz, Band 1 851 to 861 MHz, Band 2 806 to 824 MHz, Power 250 W, Insertion Loss 0.35 dB. Tags: Module with Connectors. More details for 921-856-811 can be seen below.