The BWLF-R12 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 0.12 GHz, 3 dB Cutoff Frequency 0.12 GHz, Insertion Loss 2.3 dB @0.12GHz, Rejection 20 dB @0.46GHz, 40 dB @0.71GHz, Power 30 dBm. Tags: Die. More details for BWLF-R12 can be seen below.