The CBP-1538J+ from Mini Circuits is a Band Pass Filter with Frequency 1518 to 1559 MHz, Center Frequency 1538 MHz, Insertion Loss 1.1 to 1.7 dB, Power 8 W, VSWR 1.60:1, 2.32:1. Tags: Surface Mount, Ceramic Filter. More details for CBP-1538J+ can be seen below.