The LP2500M0402BT from Frontier Electronics is a Low Pass RF Filter with Frequency 2.4 to 2.5 GHz, Insertion Loss 0.75 dB, Rejection 33 to 37 dB, VSWR 2.00:1, Operating_Temperature -40 to 85 Degree C. Tags: Surface Mount, Ceramic Filter. More details for LP2500M0402BT can be seen below.