The 3MB/C-138/H10-14 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 131.65 to 144.35 MHz, Bandwidth 12.7 MHz (0.5dB), Center Frequency 138 MHz, Insertion Loss 1.88 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 3MB/C-138/H10-14 can be seen below.