The FLLE9-4.5K from Sirius Microwave is a Low Pass RF Filter with Frequency 0 to 4.3 MHz, Stopband Frequency 5.6 to 500 MHz, 3 dB Cutoff Frequency 4.7 MHz, Insertion Loss 0.5 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter. More details for FLLE9-4.5K can be seen below.