The FLHS-33 from Synergy Microwave Corporation is a Low Pass RF Filter with Frequency DC to 30 MHz, 3 dB Cutoff Frequency 33 MHz @ 3 dB, Insertion Loss 2 dB, Rejection 20 to 50 dB @ 44 to 58 MHz, Upper Rejection 20 to 50 dB. Tags: Surface Mount. More details for FLHS-33 can be seen below.