The BWLF-1 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 1 GHz, 3 dB Cutoff Frequency 1 GHz, Insertion Loss 1.8 dB @1.0GHz, Rejection 20 dB @2.15GHz, 40 dB @2.8GHz, Power 30 dBm. Tags: Die. More details for BWLF-1 can be seen below.