The ASR315E from Abracon LLC is a SAW Resonator with Frequency 314.925 to 315.075 MHz, Centre Frequency 315 MHz, Insertion Loss 1.4 to 2 dB, Capacitance 1.8 to 2.2 pF, Quality Factor Loaded 1600. Tags: Surface Mount, SAW Resonator. More details for ASR315E can be seen below.