The FN-454W from Filtronetics is a Low Pass RF Filter with Frequency DC to 1.5 kHz, Stopband Frequency 1.9 KHz, 3 dB Cutoff Frequency 1.5 kHz, Insertion Loss 0.5 dB, Rejection 30 dB. Tags: Module with Connector. More details for FN-454W can be seen below.