The AM1250B1025 from Anatech Electronics is a Band Pass Filter with Frequency 1.22 to 1.29 GHz, Bandwidth 70 MHz, Center Frequency 1250 MHz, Insertion Loss 2 dB, Upper Rejection 50 dBc @ 900 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1250B1025 can be seen below.