The 4MB/C-400/U50-S4A from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 373.1 to 426.9 MHz, Bandwidth 53.8 MHz (1dB), Center Frequency 400 MHz, Upper Rejection 40 dB, Lower Rejection 40 dB. Tags: Lumped Component Filter. More details for 4MB/C-400/U50-S4A can be seen below.