The PDLF-R4G from Sainty-Tech Communications Limited is a Low Pass RF Filter with Frequency DC to 0.4 GHz, 3 dB Cutoff Frequency 0.4 GHz, Insertion Loss 1.6 dB @0.4GHz, Rejection 30 dB @0.76GHz, Power 30 dBm. Tags: Die. More details for PDLF-R4G can be seen below.