The 6MB/E-550/U300-S4G from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 388.05 to 711.95 MHz, Bandwidth 323.9 MHz (1dB), Center Frequency 550 MHz, Insertion Loss 0.47 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 6MB/E-550/U300-S4G can be seen below.