The BWLF-2 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 2 GHz, 3 dB Cutoff Frequency 2 GHz, Insertion Loss 1.8 dB @2.0GHz, Rejection 20 dB @3.5GHz, 40 dB @4.6GHz, Power 30 dBm. Tags: Die. More details for BWLF-2 can be seen below.