The CFN-15316 from Filtronetics is a Band Stop Filter with Stopband Frequency 1526 to 1536 MHz, Bandwidth 10 MHz, Insertion Loss 1.7 to 3.5 dB, Rejection 40 dB, Center Frequency 1531 MHz. Tags: Surface Mount, Ceramic Filter, Notch Filter. More details for CFN-15316 can be seen below.