The 2157-815-49-50 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 615.5 to 1014.5 MHz, Bandwidth 399 MHz, Center Frequency 815 MHz, Insertion Loss 3 dB, Rejection 30 dB. Tags: DIP, Lumped Component Filter. More details for 2157-815-49-50 can be seen below.