The 1906BP39B027 from Johanson Technology is a Band Pass Filter with Frequency 1.89 to 1.92 GHz, Bandwidth 27 MHz, Insertion Loss 2.8 dB, Rejection 40 dB, Power 0.5 W. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for 1906BP39B027 can be seen below.