The RO3150E from Murata is a SAW Resonator with Frequency 303.92 to 304.075 MHz, Centre Frequency 304 MHz, Insertion Loss 1.35 to 2 dB, Capacitance 3.8 pF, Quality Factor Loaded 2100. Tags: Surface Mount, SAW Resonator. More details for RO3150E can be seen below.