The LP1910M0402BT from Frontier Electronics is a Low Pass RF Filter with Frequency 1.7 to 1.9 GHz, Insertion Loss 0.6 dB, Rejection 21 to 26 dB, VSWR 2.00:1, Operating_Temperature -40 to 85 Degree C. Tags: Surface Mount, Ceramic Filter. More details for LP1910M0402BT can be seen below.