The BWLF-3 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 3 GHz, 3 dB Cutoff Frequency 3 GHz, Insertion Loss 1.7 dB @3.0GHz, Rejection 20 dB @5.55GHz, 40 dB @7GHz, Power 30 dBm. Tags: Die. More details for BWLF-3 can be seen below.