The RSR-55.00-80-B from Raltron is a SAW Resonator with Frequency 55.24 MHz (2 Channel) / 61.24 MHz (3 Channel), Centre Frequency 58.24 MHz, Insertion Loss 6 dB (Resonant Loss), Capacitance 3.6 to 3.7 pF, Operating Temperature -10 to 60 Degree C. Tags: Drop In, SAW Resonator. More details for RSR-55.00-80-B can be seen below.