The BWLF-R5 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 0.5 GHz, 3 dB Cutoff Frequency 0.5 GHz, Insertion Loss 1.9 dB @0.5GHz, Rejection 20 dB @1.3GHz, 40 dB @1.65GHz, Power 30 dBm. Tags: Die. More details for BWLF-R5 can be seen below.