The RO3104E from Murata is a SAW Resonator with Frequency 303.75 to 303.9 MHz, Centre Frequency 303.825 MHz, Insertion Loss 1.35 to 2 dB, Capacitance 3.2 pF, Quality Factor Loaded 1400. Tags: Surface Mount, SAW Resonator. More details for RO3104E can be seen below.