The BSF-2655MS1 from RF ONE Electronics is a Band Stop Filter with Stopband Frequency 2.62 to 2.67 GHz, Insertion Loss 3 dB, Rejection 40 dB, Power 40 W, Return Loss 6 to 10 dB. Tags: Module with Connectors, Cavity Filter, Ceramic Filter, LC Filter. More details for BSF-2655MS1 can be seen below.