The FN-4342W from Filtronetics is a Low Pass RF Filter with Frequency DC to 2.4 GHz, Stopband Frequency 3.5 GHz, 3 dB Cutoff Frequency 2.4 GHz, Insertion Loss 2 dB, Rejection 45 dBc. Tags: Module with Connector, Lumped Component Filter. More details for FN-4342W can be seen below.