The AE4L8838 from Anatech Electronics is a Low Pass RF Filter with Frequency DC to 2 MHz, 3 dB Cutoff Frequency 4 MHz, Insertion Loss 0.5 to 3.5 dB, Rejection 45 dB, Return Loss 15 dB. Tags: Module with Connector, Lumped Component Filter. More details for AE4L8838 can be seen below.