The FLS-12 from Synergy Microwave Corporation is a Low Pass RF Filter with Frequency DC to 10.7 MHz, 3 dB Cutoff Frequency 12 MHz @ 3 dB, Insertion Loss 1 dB, Rejection 20 to 35 dB @ 16 to 21 MHz, Upper Rejection 20 to 35 dB. Tags: Surface Mount. More details for FLS-12 can be seen below.