The RO3156A-1 from Murata is a SAW Resonator with Frequency 868.8 to 869.1 MHz, Centre Frequency 868.95 MHz, Insertion Loss 1.2 to 2 dB, Capacitance 2.1 pF, Quality Factor Loaded 850. Tags: Surface Mount, SAW Resonator. More details for RO3156A-1 can be seen below.