The BWLF-3R5 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 3.5 GHz, 3 dB Cutoff Frequency 3.5 GHz, Insertion Loss 1.7 dB @3.5GHz, Rejection 20 dB @5.95GHz, 40 dB @7.5GHz, Power 30 dBm. Tags: Die. More details for BWLF-3R5 can be seen below.