The RO3118D from Murata is a SAW Resonator with Frequency 317.925 to 318.075 MHz, Centre Frequency 318 MHz, Insertion Loss 1.4 to 2 dB, Capacitance 2.8 pF, Quality Factor Loaded 1800. Tags: Surface Mount, SAW Resonator. More details for RO3118D can be seen below.