The 5MB/E-300/U10-C3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 290.8 to 309.2 MHz, Bandwidth 18.4 MHz (1dB), Center Frequency 300 MHz, Insertion Loss 3.15 dB, Upper Rejection 60 to 66.1 dB. Tags: Module with Connectors, Lumped Component Filter. More details for 5MB/E-300/U10-C3 can be seen below.