The BWLF-R63 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 0.63 GHz, 3 dB Cutoff Frequency 0.63 GHz, Insertion Loss 1.5 dB @0.63GHz, Rejection 20 dB @1.4GHz, 40 dB @2.1GHz, Power 30 dBm. Tags: Die. More details for BWLF-R63 can be seen below.