The ACTR418/418.0/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 417.925 to 418.075 MHz, Centre Frequency 418 MHz, Insertion Loss 1.5 to 2 dB, Capacitance 1.7 to 2.3 pF, Quality Factor Loaded 2000. Tags: Drop In, SAW Resonator. More details for ACTR418/418.0/TO39 can be seen below.