The R1950 from Qualcomm is a SAW Resonator with Frequency 868.35 MHz, Centre Frequency 868.35 MHz, Insertion Loss 1.2 to 1.6 dB, Capacitance 2.2 pF, Quality Factor Unloaded 5000 to 7600. Tags: Surface Mount, SAW Resonator. More details for R1950 can be seen below.