The BWLF-R22 from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 0.22 GHz, 3 dB Cutoff Frequency 0.22 GHz, Insertion Loss 2.3 dB @0.22GHz, Rejection 20 dB @0.6GHz, 40 dB @0.9GHz, Power 30 dBm. Tags: Die. More details for BWLF-R22 can be seen below.