The 4MB/C-300/U30-S1G from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 282.1 to 317.9 MHz, Bandwidth 35.8 MHz (1dB), Center Frequency 300 MHz, Insertion Loss 1.63 dB, Upper Rejection 35 to 78 dB. Tags: DIP, Lumped Component Filter. More details for 4MB/C-300/U30-S1G can be seen below.