The DR1-4180 from ECS Inc. International is a SAW Resonator with Frequency 417.925 to 418.075 MHz, Centre Frequency 418 MHz, Insertion Loss 2 dB, Capacitance 1.7 to 2.3 pF, Quality Factor Loaded 2100 Q. Tags: Drop In, SAW Resonator. More details for DR1-4180 can be seen below.