The FLP-850 from Synergy Microwave Corporation is a Low Pass RF Filter with Frequency DC to 780 MHz, 3 dB Cutoff Frequency 850 MHz @ 3 dB, Insertion Loss 1 dB, Rejection 20 to 35 dB @ 1130 to 1485 MHz, Upper Rejection 20 to 35 dB. Tags: Plug In. More details for FLP-850 can be seen below.