The WLK9-260-700-40-6000-20 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 260 / 700 MHz, Stopband Frequency Chosen Fco x 1.125 to 6 GHz, 3 dB Cutoff Frequency Choice of 260 to 700 MHz, Insertion Loss 0.7 to 1.1 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLK9-260-700-40-6000-20 can be seen below.