The 6MB/C-300/U400-18 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 95 to 505 MHz, Bandwidth 410 MHz (1dB), Center Frequency 300 MHz, Insertion Loss 0.25 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 6MB/C-300/U400-18 can be seen below.