The DR2-4339 from ECS Inc. International is a SAW Resonator with Frequency 433.845 to 433.995 MHz, Centre Frequency 433.92 MHz, Insertion Loss 10 dB, Capacitance 1.3 pF, Quality Factor Loaded 5500 Q. Tags: Drop In, SAW Resonator. More details for DR2-4339 can be seen below.