The RO3156D-2 from Murata is a SAW Resonator with Frequency 868.85 to 869.05 MHz, Centre Frequency 868.95 MHz, Insertion Loss 1.2 to 2.5 dB, Capacitance 2.2 pF, Quality Factor Loaded 850. Tags: Surface Mount, SAW Resonator. More details for RO3156D-2 can be seen below.