The CSI-FLTR-10NF10-811/856 from Westell Technologies is a Band Pass Filter with Frequency 806 to 861 MHz, Bandwidth 55 MHz, Insertion Loss 2.0 dB, Power 10 W, Ripple 1.2 dB. Tags: Module with Connectors. More details for CSI-FLTR-10NF10-811/856 can be seen below.