The BRF-400-40-L5 from COTS RF is a Band Stop Filter with Stopband Frequency 380 to 420 MHz, Bandwidth 40 MHz, Insertion Loss 1 dB, Rejection 60dB @ 400 MHz, VSWR 2.00:1. Tags: Module with Connectors, Notch Filter. More details for BRF-400-40-L5 can be seen below.