The ASR433.42E from Abracon LLC is a SAW Resonator with Frequency 433.345 to 433.495 MHz, Centre Frequency 433.42 MHz, Insertion Loss 1.5 to 2.5 dB, Capacitance 2.3 pF, Quality Factor Loaded 2200. Tags: Surface Mount, SAW Resonator. More details for ASR433.42E can be seen below.