The WBLB-T-BP-4-0.8-L from A-Info is a Band Pass Filter with Frequency 3.6 to 4.4 MHz, Insertion Loss 1 dB, Rejection 50 dB, VSWR 1.50:1, Operating_Temperature -20 to 50 Degree C. Tags: Module with Connectors, Lumped Component Filter. More details for WBLB-T-BP-4-0.8-L can be seen below.