The TFS1237C from Vectron International is a Band Pass Filter with Frequency 1215 to 1237 MHz / 1237 to 1254 MHz, Insertion Loss 3.7 to 4.5 dB, Rejection 12 to 32 dB, Upper Rejection 12 to 32 dB, Lower Rejection 20 to 27 dB. Tags: Surface Mount, RF SAW Filter. More details for TFS1237C can be seen below.