The WLF4-0.15-5-50-200-100 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 0.15 / 5 MHz, Stopband Frequency Chosen Fco x 2 to 200 MHz, 3 dB Cutoff Frequency Choice of 0.15 to 5 MHz, Insertion Loss 0.4 to 0.5 dB, Rejection 50 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLF4-0.15-5-50-200-100 can be seen below.