The TWFCB-866M02-C04M40-N03 from Techniwave is a Band Pass Filter with Frequency 865 to 867 MHz, Bandwidth 2 MHz, Center Frequency 866 MHz, Insertion Loss 4 to 4.8 dB, Upper Rejection 50 to 70 dB @ 869 MHz, 871 to 960 MHz. Tags: Module with Connectors. More details for TWFCB-866M02-C04M40-N03 can be seen below.