The TFS1581 from Vectron International is a Band Pass Filter with Frequency 1555.42 to 1595.42 MHz / 1559 to 1563 MHz / 1563 to 1587 MHz / 1574.22 to 1576.62 MHz / 1587 to 1591 MHz / 1593 to 1610 MHz, Insertion Loss 4 to 5 dB, Rejection 7 to 38 dB, Upper Rejection 10 to 38 dB, Lower Rejection 7 to 34 dB. Tags: Surface Mount, RF SAW Filter. More details for TFS1581 can be seen below.