The ECS-SDR1-4339 from ECS Inc. International is a SAW Resonator with Frequency 433.845 to 433.995 MHz, Insertion Loss 1.4 to 1.8 dB, Capacitance 2.3 to 2.9 pF, Quality Factor Loaded 1200 Q, Quality Factor Unloaded 9200 Q. Tags: Surface Mount, SAW Resonator. More details for ECS-SDR1-4339 can be seen below.