The RSR-315.00-250-X from Raltron is a SAW Resonator with Frequency 314.75 to 315.25 MHz, Centre Frequency 315 MHz, Insertion Loss 2.5 dB (Resonant Loss), Capacitance 3.2 pF, Operating Temperature -10 to 60 Degree C. Tags: Drop In, SAW Resonator. More details for RSR-315.00-250-X can be seen below.