The AM2500B1585 from Anatech Electronics is a Band Pass Filter with Frequency 2.45 to 2.55 GHz, Bandwidth 100 MHz, Center Frequency 2500 MHz, Insertion Loss 1.6 dB, Rejection 55 to 60 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for AM2500B1585 can be seen below.