The RSR-303.875-250-X from Raltron is a SAW Resonator with Frequency 303.625 to 304.125 MHz, Centre Frequency 303.875 MHz, Insertion Loss 2.5 dB (Resonant Loss), Capacitance 4 pF, Operating Temperature -10 to 60 Degree C. Tags: Drop In, SAW Resonator. More details for RSR-303.875-250-X can be seen below.