The RO3120C from Murata is a SAW Resonator with Frequency 403.475 to 403.625 MHz, Centre Frequency 403.55 MHz, Insertion Loss 1 to 2 dB, Capacitance 3.7 pF, Quality Factor Loaded 1000. Tags: Surface Mount, SAW Resonator. More details for RO3120C can be seen below.