The BWLF-2R5G from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 2.5 GHz, 3 dB Cutoff Frequency 2.5 GHz, Insertion Loss 1.6 dB @2.5GHz, Rejection 20 dB @3.9GHz, 40 dB @4.2GHz, Power 30 dBm. Tags: Die. More details for BWLF-2R5G can be seen below.