The AM2437B1327 from Anatech Electronics is a Band Pass Filter with Frequency 2.4 to 2.474 GHz, Bandwidth 74 MHz, Center Frequency 2437 MHz, Insertion Loss 2 dB, Rejection 20 to 30 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM2437B1327 can be seen below.