The HG124LA from Microarray Technologies Corporation is a Low Pass RF Filter with Frequency DC to 4 GHz, 3 dB Cutoff Frequency 4 GHz, Insertion Loss 1.7 dB, Rejection 24.6 dB @5.7 GHz, 53.5 dB @7.1 GHz, Return Loss Input 25 dB. Tags: Surface Mount. More details for HG124LA can be seen below.