The 4MB/C-1012/U40-18 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 991 to 1033 MHz, Bandwidth 42 MHz (1dB), Center Frequency 1012 MHz, Insertion Loss 3 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 4MB/C-1012/U40-18 can be seen below.