The DR2-4180 from ECS Inc. International is a SAW Resonator with Frequency 417.925 to 418.075 MHz, Centre Frequency 418 MHz, Insertion Loss 10 dB, Capacitance 1.4 pF, Quality Factor Loaded 5500 Q. Tags: Drop In, SAW Resonator. More details for DR2-4180 can be seen below.