The WLK7-300-700-60-6000-20 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 300 / 700 MHz, Stopband Frequency Chosen Fco x 1.3 to 6 GHz, 3 dB Cutoff Frequency Choice of 300 to 700 MHz, Insertion Loss 0.55 to 0.95 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLK7-300-700-60-6000-20 can be seen below.