The BWLF-4R8 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 4.8 GHz, 3 dB Cutoff Frequency 4.8 GHz, Insertion Loss 2.5 dB @4.8GHz, Rejection 20 dB @5.8GHz, 35 dB @6.5-20GHz, Power 30 dBm. Tags: Die. More details for BWLF-4R8 can be seen below.