The QLF-1-40 from Qualwave is a Low Pass RF Filter with Frequency DC to 1 MHz, Stopband Frequency 4 to 100 MHz, Insertion Loss 1.5 dB, Upper Rejection 40 dB @ 2 to 4 MHz, 50 dB @ 4 to 100 MHz, VSWR 1.50:1. Tags: Module with Connector. More details for QLF-1-40 can be seen below.