The FLD-450 from Metropole Products Inc. is a Low Pass RF Filter with Frequency DC to 450 MHz, Stopband Frequency 800 - 3000 MHz, Insertion Loss 0.5 dB, Rejection 40 dB@670 MHz, 50 dB@740 MHz, 60 dB@800 - 3000 MHz, VSWR 1.40:1. Tags: Module with Connector, Lumped Component Filter. More details for FLD-450 can be seen below.