The SR5906 from Vanlong is a SAW Resonator with Frequency 868.35 MHz, Centre Frequency 868.35 MHz, Insertion Loss 1.6 to 2.2 dB, Capacitance 2.25 to 2.85 pF, Voltage 30 V. Tags: Surface Mount, SAW Resonator. More details for SR5906 can be seen below.